The trick is to look at the source of the advice and think about why that advice worked for them. What aspects of their situation are similar to yours?
So all advice is good, provided you use it all as inputs to your decision making and consider the context when you decide which advice to lean into.
Reading between the lines, it seems like this founder is telling others advice he's trying to tell himself.
Exactly because of the same reason you write about.
Someone giving advice usually does not have all needed context of your situation. At the same time they are not going to give you all the context they were in while taking similar decision.
Even if you would deal with the same people as that person, those people might just not like you and they liked him/her. Where someone giving advice will think they are just like that for everyone.
Even advice about "great restaurant" is probably bad, because well they were there a while ago, maybe chef will have a bad day or you will get a rude waiter because you will sit in a different spot, maybe they were there with great friends and you want to go with a girlfriend. It might turn out that restaurant was not that great when you arrived.
I get to know about things like series from friends or sites. But I don't have any expectations and quickly judge if it is crap or not, well with "it is a crap" as default and expect to be positively surprised.