This will fall prey to the fallacy of thinking that because someone is an expert in one area they will be an expert in other areas. Wish there was a formal name for it.
Agreed. The natural followup to the endorsement is the opportunity for advisement, and I would imagine working founders would only care to advise on startup ideas they themselves cared about, taking us back to the original post's strategy.
I don't know about a formal name, but there definitely is an XKCD :-) https://xkcd.com/793/