I’m hardly disputing, I know the history. Just as a music creator who also happens to be interested in the history of how music spreads and changes, picking one particular fixed date as the genesis of a genre feels strange because genre shifts to the point where you can listen and say “hey this has become something new and different” are not overnight things.
Its certainly possible to identify influential moments but defining moments are much more difficult. In context, when Herc first looped breakbeats, the MCs were still really only serving the crowd hyping function, the DJ was still the main attraction. It wasn’t really until later on where the MC performed unique rhymes as the front attraction. We certainly still hear those early examples as hip hop but the genre didn’t really solidify until after the first looping of break beats.
Similarly its hard to nail down the first moment of any genre that developed out of something else. When exactly did musique concrete become “industrial”? What was the moment that electric hard blues rock became “metal”? And so on and so on.
I think here Google is trying to put a technological view (first supersonic flight, first transistor, first integrated circuit) on something thats more like Darwin’s finches.