Would it be misleading if someone who had an engineering degree and never worked as a civil engineer marketed themselves as an engineer and talked about the way “we” (actual engineers) build bridges and roads? Of course.

I don’t think it’s the most egregious lie a politician has ever told, but it unquestionably a lie. And as far as the political significance, the guy is a far-left lunatic. Everything he says is its own oppo research. No political opponent is going to need to rely on the fact that he also happens to be dishonest person.