Since my work is vaguely related to superconductors, I saw this comment and was excited to dig into all the errors in the article, but actually couldn't find any in the parts discussing the superconductors specifically. (I don't know data centers and can't comment on that bit.) 77 K is indeed an appropriate temperature for LN2 coolant for high-temperature superconductors like they're using. What errors did you see?
Otherwise nothing pops out to me.