7GW (is that annually or daily)... wow!
To give a rundown here of how this works, there are concepts called power and energy. Energy measures are of the actual, whereas power is the rate of transfer of that amount, generally expressed as an amount per second. So, there is a thing called a Joule, which is a measure of energy, as in the actual amount. Whereas there is also a thing called a Watt, which is a measure of power, with the Watt being 1 Joule per second. Due to legacy matters regarding billing, energy is often expressed in terms of Watt-hours, being the amount of energy you would get from a rate of one Watt (one Joule per second) over one hour. This is confusing to many because it is taking an energy term divided by a time term and then adding another time term and a pretty much random multiplier (3600, the number of seconds in an hour). So, one Watt-hour is actually 3600 Joules.
So, with this you should see that your question is highly confused. There is no such thing as "(is that annually or daily)" for 7 GW since it's a rate. Now, there is some nuance to that because the rate in question, 7 GW, is probably what is called nameplate capacity. That's more or less the maximum the equipment can be expected to generate under any conditions. There is some leeway there. It might actually be able to produce more when it's new, etc. but that's the certified rate you can expect from it under ideal conditions. Now, in the real world, it is subject to a capacity factor. That's basically the percentage of the capacity factor that it actually can be expected to produce under real world conditions. For offshore wind, that's something like 40% to 50%. So 2.8 to 3.5 GW typically.
Now, since that's a rate, if you want to know what that is annually or daily, you just multiply the computed rate based on capacity factor times the number of hours you want to examine. So, for a day, you would multiply by 24 and get 67.2 to 84 GW-hours. For a year, you would multiply by (365.2242 * 24) to get 24.543 to 30.678 TW-hours per year (which I find ridiculous because it's adding yet another time term equivalent to seconds times another arbitrary factor). However, I should mention that the context that's really missing from that post is if they mean wind power, or off-shore wind specifically. If it's wind power in general, the lower bound for capacity factor is a little lower. Fair to say that we're looking at around 20 to 30 TW-hours per year.
So, for the 4.086 PW-hours per year you mention which sounds like total US electrical power usage per year, that would be around .48% to 0.75%. Since that's an amount added in a year, it should be mentioned that's a fairly slow year, just a few years back, the US was adding more than double that per year. In the last ten years, close to 100 GW of wind power nameplate have been added in the US. So, that would be roughly 10% of US electrical usage. That's not too far off on the official figure for total wind power in the US. Then if you add solar, the US gets just under 20% of its electricity from wind and solar. For renewables in general, it's about 25%. Now, I will note that some of the renewable is from burning biomass, and about 20% of that "biomass" is garbage and 45% of that non-renewable materials like plastic that really shouldn't count, but it's a negligible portion of the overall total since biomass burning is under 1%, so we're talking about around 0.1%.
As for universal parts... Interesting, you're not the first person in this discussion to bring up that oddly specific question. It's not like not having standardized parts isn't a real issue, but it's also perfectly normal in a multi-vendor, relatively new marketplace. I am, of course, all for establishing a system of standardized common parts, but the fact that you bring it up seems so odd. Of course, a little research shows that the reason is that it looks like it's part of a so called "messaging toolkit" from the Heartland Institute. Basically, they compile lists of talking points, then distribute them to right-wing media, then consumers of that media are expected to essentially astroturf those points. So I'm curious, did you spontaneously come up with that concern yourself or, if not, where did you pick it up from?
As for the numbers from China being fake... I certainly would not put it past China's government. Honesty is not their strong suit (of course, that's hardly untrue of the US either), but claiming that it's false is problematic. It's a bit like claiming that the moon landings were faked, when you can set up a laser system yourself to verify the presence of the detectors. In other words, we have satellites and wind turbines are big, and you can estimate their output based on their size and other factors. In order to fake that without being called out by the rest of the world, just lying is not enough, instead there would need to be a massive conspiracy to make fake wind turbines. Plus, the fake turbines would need the blades to spin and also for the fake nacelle to turn with the wind.
Now I can't help thinking of the Mitchell and Webb bit on the fake moon landing conspiracy
"So, we're not actually going to make any kind of saving in terms of the cost of a massive rocket?"
"No, but we will be making a saving on the cost of actually going to the moon."
"True, true, and what costs are involved in actually going to the moon."
"Well, the main one, to be honest, is the massive rocket."
"Any others?"
"Well, other than that, it's mainly catering."