Well, for one thing after Finn Jones said it, and for the other that was after some people saw it as a controversy that a white guy was cast at all. But if you scan the reviews on the Metacritic site, for example, mostly the problems are that the show is seen as unoriginal, not very well-written, and that the fighting isn't impressive. That's what the reviewers were actually interested in, and I think the same certainly goes for the average viewer.
There was controversy about Strange, too - another rich white guy, and one who spouts zen-like wisdom to boot! - and that movie was still well-received and successful.
Well, Finn's point is hard to rebut, because that change is a very recent thing - it'll be a while until we have more white-millionaire characters debuting on TV. So whether you want to go with Finn's theory is a matter of belief, as of this point, and will stay so for a while.
But the article points out the actual problems of the show pretty well, and Marvel would do well to blame those and not Trump if and when they think about making a second season of this show.