I think Dr Strange accidentally merges Raimi and Webb's Spider-Man universes together with the MCU; essentially rewriting their history to fit within Earth-199999's, but essentially erasing Earth-96283 (Raimi) and Earth-120703 (Webb) from the Multiverse. (Maybe even making it's OWN new reality that is now branched/locked off from Earth-199999.)
Similar to WandaVision, characters that can't coexist as two different versions in the same timeline (Tobey and Andrew's Spideys) are renamed with altered histories (think Ralph Boner). BUT with faint memories of their previous lives that MCU's Peter will reawaken by the end of the film. While characters that never existed on Earth-199999 will not be renamed like Osborn, Octavius, Venom, etc but now part of MCU Peter's history.
There is your "Sony Spider-Man Universe".