Is Spider-Man Far From Home lying about the multiverse?

Trailers for 'Spider-Man: Far From Home' suggested that Mysterio (Jake Gyllenhaal) hailed from the greater multiverse. Were they lying?

The 'Spider-Man: No Way Home' Exit Survey - The Ringer

Mysterio from Spider-Man: Far From Home wasn't actually from another universe, but he mentioned something about Earth-616, despite the MCU being 199999. How does he know of the 616 universe? - Quora

The Vampirino Storyteller — Psycho Analysis: Mysterio

Tom Holland reveals 'Spider-Man' planned to hide villains

Spider-Man Fans Compile Video Of No Way Home's Surprising Star Denying They Were In The Sequel

How Spider-Man: Far From Home Deals With The Events Of Avengers: Endgame, Movies

Spider-Man: Far From Home (Film) - TV Tropes

Spider Man: Far From Home New Trailer Gets Leaked Online and There are Some Good Surprises Lying Ahead of You (Watch Video)

Spider-Man: Far From Home' Director Interview on Biggest Twists

Spider-Man: Far From Home Ending Explained (In Detail)