No, he said he made up the term, based on that speech, but that speech was describing an old strategy that the Russians understood Eastern European/Middle Easte

No, he said he made up the term, based on that speech, but that speech was describing an old strategy that the Russians understood Eastern European/Middle Eastern uprisings to be a result of. It's basically guerilla warfare + a psychological component. Everything Gerasimov was quoted as saying in that link you provided is what has taken place in Ukraine and elsewhere. The academic community has a growing literature on this if you'll check google scholar. There's virtually no doubt it is a real phenomenon even if the term has to be used with nuance (as that article says). He's saying that the behavior that "Gerasimov's doctrine" describes is not an actual doctrine. but it exists.