Which should honestly be a warning sign.

Why is that?

The EMDrive didn't pan out.

Does LK-99 defy the laws of physics like the EmDrive did?

A room temperature and pressure semiconductor is more an astoundingly large jump forward in the space than something that defies known physics.

That doesn’t track. The EmDrive was legitimately pushing a premise that we had some fundamental law of physics wrong. Superconductors are pretty well understood, they’ve been around for a while. Finding a room temperature one isn’t that big of a jump, it’s just a really hard one to make.

You're in agreement with the GP, their comment was just hard to parse.

Perhaps it would have been clearer to say "than it is something..." . Too late to edit at this point unfortunately.