That's because we're having a casual conversation, and the reader is supposed to pick up on context. This is not a proof or a paper.
People write many things on the internet, and it is still surprising to me how they choose to do that. I wouldn’t be concerned about most of it, particularly if it is about topics I know to be deep. I for one looked into some articles on the internet at some point, Godel or not, I made the mistake of thinking that they write what they knows of.
As for godel, I’m sure you can find contemporary math/philosophers.
Another example was in grad school in mathematics. I knew one particular thing was off but I couldn’t place it. A long time has passed since. Recently I came across a note from a math professor who had spent the time to go through all books covering the subject, and explains what everyone had missed. I agreed with him.
That's a quite a bit weaker of a claim than "philosophers don't understand Gödel's theorem". To back that up you need to point to some philosophers who (a) discuss Gödel's theorem in such a way that (b) they demonstrate their lack of understanding. As it is you're just claiming that one particular subfield of philosophy doesn't have much overlap with another. How is that an indictment of the field? There are few computer scientists working at the intersection of quantum computing and database theory. There are few physicists working at the intersection of biophysics and string theory. It's not a meaningful criticism unless there's reason to think that there is something in the intersection that practitioners are culpable for overlooking, and you haven't provided any such reason.