That was actually a really well researched piece about an interesting subject but his conclusion that the flag itself is racist is tenuous. The race angle is only really mentioned in the first paragraph and the headline though, which makes me think it was added later as clickbait.
Dear liberals, if you want to avoid giving right-wingers the satisfaction of being proved right, try to avoid throwing around the term 'racist' like a meaningless epithet. The "institutionalized racism doesn't exist" narrative already has enough traction among disgruntled whiteys; don't give Rush Limbaugh any more ammunition, please.