[Someone]

> Notice that I said “invented” vacuum tubes because the behavior comes from careful engineering and manufacture which didn’t exist in the known universe before that.

That would mean an invention can become a discovery, potentially millennia later, if we discover (no pun intended) that the thing already existed in some form. I think few people would agree with that.

Also, the same ”discover or invent?” question is frequently asked about mathematics, where “exist in the known universe” is very much open for interpretation. Euclidean geometry ‘existed’ in the known universe for centuries, for example, until Einstein found out that it didn’t.