Environmentally conscious buyers buy the environmentally conscious car, but the most popular "car" in the US is the Ford F-150. What do you suppose you tweet to get them to buy a Cybertruck?
Cars like that are so much about image that I suspect you just can't; the Cybertruck is likely simply too stupid-looking for most F-150 buyers, no matter what the CEO says on Twitter.
Googling a bit the F-150 sells about 750,000 a year and "By the end of November 2023, there were approximately 2 million reservations for the Cybertruck" (estimate off Wikipedia).
Reservations are not the same as sales but there seem to be buyers out there who don't think it's too stupid looking.
If he made a steam powered car out of bronze and wood, I can't imagine him tweeting anything that would encourage sales, but I can easily imagine a variety of things he could tweet which could discourage sales — in my imagination, this would be things like "antiques are for losers".
The premise in both cases is that a) there is at least some demand for the thing and b) customers are paying attention to him.
If a) isn't true then it isn't possible to lose sales because there aren't any. This is the "any publicity is good publicity" scenario because your baseline sales are zero. If a) is true then it's about saying things your target customers approve, and then we're back to "target customers for trucks are typically not environmentally conscious libs, and like to see them criticized."
Which was the other problem with your analogy: If he's selling some steampunk thing then he'd be criticizing whatever the opposite of that is, not its expected customers. Then the risk is alienating some other customers for some other product, but in a politically polarized environment the only way to please everybody is to say nothing. And then nobody is paying attention to you and that doesn't drive sales either.
