I'm suspecting it's fraud. In a few months they'll come out and admit they fudged the numbers. I honestly hope not, room temperature superconductors solve a lot of problems, but we've been down this road before.
More likely, if it doesn’t pan out, they’ll come out and say “this is why we didn’t originally publish, because we weren’t confident in our work, but _somebody_ just had to go and disclose our (suspect) preliminary results. This behavior is also why we were happy that person had left the lab. Our work continues…”