Mobile Nuclear Labs?

This "Israel air raid on Syria" story is odd. So, it's not clear what the Israelis were doing, and the rumor that they were striking at some kind of North Korean nuclear facility transplanted to the Syrian desert is really strange. My impression is that an honest-to-goodness nuclear facility is hard to move. Harder to move halfway around the world, in secret, when . . . just assuming that . . . the U.S. has spy satellites keeping an eye on PRK nuclear facilities.

Not an expert, but this "story" just doesn't make sense to me.