We're getting a point where anecdotes are being used in place of reason. I'd think you want to ask "how many bug bounties are earned by humans vs AI assistants?" If there's money to be made in finding 0-days then shouldn't there be ample evidence of this?
Which is why I'm confused. A limited number of particular people say there's this giant sea change. I cannot find any hard evidence that's true.
If anthropic blog was trying to _sell me_ on their service they failed miserably. So I guess my assumption can, at least, safely be, they have no idea how to market their own product.