At worst, it's not going to convince anyone to vote for Trump and not Biden.
I think you underestimate the degree to which pig-ignorant dickheads are prepared to act against their own interests in order to demonstrate their dislike for intelligent people.
The same fuckwits who were happily wasting their own money to make their vehicles less efficient, more expensive to maintain, and dirtier, by "rolling coal" in order to "own the libs" are more than likely to be convinced to vote for Trump by this announcement.
Even if it crashes the economy and leaves them homeless, jobless, and destitute, they will think it worthwhile if it slightly annoys a Democrat voter.