You asked who’s making these silly claims, I provided one example of YC partners doing it. Not sure who got triggered or what advertising you are talking about, but there you go.
What you showed me is the equivalent of somebody saying, “People are claiming my life would be better if I drank more Pepsi” and the underlying evidence turned out to be a Pepsi commercial.
I’ll admit this is not helping the case of “but people are saying…”