The headline is sufficient for those who do not understand how the power grid works, and anyone who knows how the power grid works would not be misled by the headline.
Even though my bill says "100% wind" on it, and somewhere out there are windmill(s) generating as much electricity as my home consumes, the actual power consumed in my house might just as easily come from the coal plants up the highway. It's all on the same grid.
Fair enough: electricity is fungible, and it doesn't matter what powers what (if it is even possible to tell).
If you understand that, then it's obvious that "Power Every US Home With Renewables" means "Generate As Much Renewable Energy As All Homes Consume". What appears on the bills of those homeowners is irrelevant.
If you had said enough
1. That the non-domestic part of the grid will reserve enough spare capacity to cover any shortfall from renewables.
2. That you can dump an unlimited amount of energy onto the non-domestic part of the grid and still count it towards your target, even if it isn't actually needed at the time.
I'm not saying that increasing renewable capacity in this way is a bad thing - it depends on the details, and in any event I'm not from the US so won't have to pay for it. The claimed outcome sounds overstated though.