Yaakov's point wasn't that all Trump voters are uneducated hillbillies - but you have to admit that if you were to ask an uneducated hillbilly whether they voted for Trump - or if he was actually president now - you'd probably get an affirmative.
To quote John Stuart Mill: “Conservatives are not necessarily stupid, but most stupid people are conservatives... I never meant to say that the Conservatives are generally stupid. I meant to say that stupid people are generally Conservative. I believe that is so obviously and universally admitted a principle that I hardly think any gentleman will deny it. Suppose any party, in addition to whatever share it may possess of the ability of the community, has nearly the whole of its stupidity, that party must, by the law of its constitution, be the stupidest party; and I do not see why honorable gentlemen should see that position as at all offensive to them, for it ensures their being always an extremely powerful party...".
To recast that into hillbillies and MAGAts, not all Trump voters are hillbillies, but most hillbillies are Trump voters.