and proof that frontier LLMs can reverse engineer / clone well (...duh), this is a big pile of nothing.
I don't think this is proof.
It's proof that they can make something that appears to reverse engineer / clone well.
To really know, we'd need to use it as daily drivers long enough to give it a good test. And it hasn't been out long enough for that.
From previous experience we know that LLMs are great at confidently producing plausible output with problems that are hard to detect and fix without expert level knowledge and experience.