Realistically, those are probably still useful in situations like this, because the authorities can more easily filter out compliant air traffic when they're trying to monitor/investigate something like this. Without it, they'd need to find the needle in a much bigger haystack.

I know you're being snarky, but those things are not required. Remote ID is still months/years away from being required - there isn't even a published specification yet, much less anything on the market that conforms to it.

Whomever this was presumably broke many laws, but the things you mentioned aren't among them.