For me, I think it is good faith because the only people who can benefit from criticism of tactics are the socialist and anti-racist movement themselves. The article doesn't directly say "it's all for naught, there is no way to win", which is what I would expect from a bad faith author (like a fed, a liberal, someone who wants to discourage the people etc).

I think it's fair to say that one disagrees with this or that bit of criticism w.r.t this article but I would personally disagree with stating that the author needs to be gulaged or whatever. THAT is unfair.