I too agree that Donald Trump is probably not racist - but I use that phrase in a very specific way: I mean only that I don't believe his actions are
motivated by racial prejudice.
That, however, does not preclude wilfully pandering to & profiting from the racial prejudices of others - "acting racist" as compared to "being racist", if you will. And I believe he's far less innocent on that count.
For a good illustrative example, consider the historical incident where the DoJ sued him & his company for refusing to rent to black people[0]. I see no need to assume he did that out of any personal dislike of ethnic minorities - far more plausible, IMO, is that his motivation was the (arguably accurate, if distastefully cynical) notion that it was more profitable to discriminate: a combination of factors (eg, "white flight", and the generally-worse employment prospects for black people - ie, consequences of past institutional discrimination & of the prejudices of others) would have meant that renting to black people could be bad for the bottom line.
Or take his final campaign advert, with its ominous talk of a "global power structure" who "control the levers of power" over grained-up photographs of influential Jews[1] - again, I very much doubt Trump himself is personally anti-semitic; but I find it hard to argue with the interpretation (shared by the ADL, among others) that it was designed to pander to the anti-semitic sentiments that some parts of the electorate hold. And if reports from inside his campaign[2] are to be believed, Trump insisted on editorial oversight on every TV ad - so it's not like that could be passed off as, say, Bannon running that message without his knowledge.
That particular case does cause me to take exception to the article's somewhat histrionic passage about anti-Trump people crying "globalists? that means jews!": they're pointing out the anti-semitic euphemisms, not coining them - the author's shooting the messenger a bit there. That said, I do take his point that it could lead people who do earnestly blame "globalists" for their problems, with no prejudiced intent, into the arms of those who use the term in its anti-semitic sense.
Regardless, all-in-all, it's an interesting and thought-provoking essay - even if I don't agree with all of it.
[0] http://www.politifact.com/truth-o-meter/statements/2016/sep/...
[1] https://www.washingtonpost.com/news/the-fix/wp/2016/11/06/se...
[2] http://www.nytimes.com/2016/11/07/us/politics/donald-trump-p... (subheading "I'm Going to Win")