Your post is actually the first I've heard of this one, so I poked around a little.
Literally nothing I found instilled any confidence this guy will be delivering any trucks. At all. It almost reads like a ploy to scam money out of people who are anti-Slate and playing up as much as possible about the differences between the gas and electric. Just reading the "how it stacks up" section on their website tells me everything I need to know about their intentions.
Somehow the "gas I4" is "proven" - but they don't say what engine it is or will be, but it's already "proven" (and never mind the 500k mile "powertrain life" claim). The REO seats "up to 6" but for the Slate, 5 "costs extra". Are they trying to imply the double cab or SUV version of the REO will be the same price as the 2-door pickup? Good luck with that. And the big-ticket repair? Surely an engine failure would be considered a big-ticket repair and not "affordable" for the REO, no? If the battery on an EV is "$$$$", so is the I4. And let's just ignore the 10 yr/110k mile battery warranty for the Slate. Are these people going to warranty their engine for 10 years (or maybe the 500k miles they claim for the powertrain life)? I also don't quite buy the 600 mile range of the REO - that would require, at a minimum, a 24 gallon tank (using their estimated 25 mpg) - which would be HUGE for a truck that size. Where do they plan to put that? That's way bigger than any current mid-size pickup and this thing is supposed to be a lot smaller than those.
And I'm just going to otherwise ignore the out-of-date other specs for the Slate. Sure, they were just officially updated yesterday - but there's no way anyone at REO doesn't already know that.
There's usual marketing speak and then there's just plain deception and bullshit.
Having said all of that, if they can manage to produce something at least close to the specs they're claiming, close to the timeline they're projecting, and close to the price they're estimating, that would be great. We need more disruption in the US auto industry, of any kind. But I just don't see a single reason to believe anything will actually happen with it - especially at $21k (more than 2 years from now). I hope they prove me wrong though.
Website: https://reotrucks.com/