I suppose the title "brand names that became common words" implies that it was a brandname before being a common word, otherwise the reader should pretty much never assume that.
Trademarks are context sensitive, and zoom was not used as a term for video calls before that. It is interesting that that's the only one on the list that isn't also a made up word
Where do you draw the line between made up words and non-made up words? It’s not like a supernova explosion creates new words that land on a forming planet so that a billion years later a new sentient species can just pick them up from the ground and start using them.