Yeah, but he gave you an affirmative answer, that it did make him more productive, and you keep moving the goalposts as I watch.

Not only that, I think you're misrepresenting his claim:

> I suspect I’m likely 5-10x more productive, though it depends exactly what I’m working on

1) He didn't say 10-100x

2) He said it depended on the work he was doing

Those seem reasonable enough that I can take his experience at face value.

This isn't about you pressure testing his claim, this is about you just being unwilling to believe his experience because it doesn't fit the narrative you've already got in your head.