I think you've just demonstrated why it's dangerous to have a single official keeper of truth. You're conflating policy judgments with factual correctness, but facts don't necessarily directly lead to policies. We must first judge the facts through our personal lenses of values, and that can lead to different conclusions.

National Review certainly has a political bias, but they're generally pretty good with keeping contact with reality, factually. The fact that they arrive at different conclusions is no reason to try to blacklist them.

It's just "National Review" and it's the preeminent conservative opinion journal. If it's illegitimate, then there can be no legitimate opposition I suppose? Maybe that's your point?

I've seen excellent articles in National Review from time to time. I'm not a regular reader by any means, but a blanket statement like this isn't useful. It leans conservative, but it's also pretty upfront about that fact.