[xg15]

Yep.

My guess is that the aggression is part of the ruse. Trying to start drama/intimidating the other when your bluff is being called out is the oldest strategy...

(You could see a similar pattern in the xz backdoor scheme, where they were deliberately causing distress for the maintainer to lower their guard.)

Or maybe the guy here hoped that the reviewers would run the demo - blindly - and then somehow believe it was real? Because it prints some scary messages and then does open a shell. Even if that's the only thing it does...