Pretty sure those are anomalies. That, and Kanye and Radiohead are pretty well-adored by Pitchfork. By and large, they do tend to give lower scores to artists that go major.
We can agree to disagree on that. I agree that they're well-adored by Pitchfork but that's because, well, they make good music. It makes sense that good music is praised. Either way, it's NOT true to say that all major label artists lose a point on Pitchfork for being major label artists like that person said.