No? CoreScripts cannot be created by developers in Studio and published to their games. That would be a horrific security flaw.
I agree, 2 of the warnings look like they can be fixed by changing code. I know that the Player:Move called, but player currently has no humanoid warning happens when you destroy a character but don’t set Player.Character to nil, the one below it looks like someone used an unsafe API in parallel scripts, which will cause the unsafe API to be disabled and do nothing.