[zepto]

> GP explicitly states that it is their experience.

GP states that their experience gives them enough insight into other people’s productivity to make a detailed assessment.

> They do not need a peer reviewed paper to describe their experience.

They aren’t describing their experience. That’s the point. They are adding the words ‘in my experience’ to a generalization that they almost certainly don’t have the experience to make.

What would make their claim plausible would be if they were a researcher.

> That's ridiculous.

No it isn’t.