What happened is that it wasn't a FAANG engineer replicating what they know, rather one asked Claude what to do and it told them to replicate what it knew.
That's how the knowledge that it was a facsimile was lost.
Oh yeah? How do you know? Were you sitting next to them? Have any screen recordings you can share?
Oh yeah? How do you know? Were you sitting next to them? Have any screen recordings you can share?