It can prove citations exist. It can't prove the AI accurately characterized what the citation says—did it confuse dicta with holding? Misstate the outcome? Invert the reasoning? That's still on the lawyer to verify, which is where the "Truth Tax" comes from.
But even that's not the main point. The article is about detecting what's missing from a document production—broken email threads, suspicious timing gaps, custodians who should appear but don't. No amount of citation checking helps you find evidence that was never produced.