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?

Mysterio's Spider-Man: Far From Home multiverse dimensions, explained - Polygon

6 Deleted Scenes Spider-Man: Far From Home (including Peter's To-Do List) : r/marvelstudios

Spider-Man: No Way Home Originally Planned To Keep Its Multiverse Crossover a Secret - IGN

The Vampirino Storyteller — Psycho Analysis: Mysterio

Proof Mysterio Is Lying About The Multi-Verse In Spider-Man: Far From Home

Spider-Man Far From Home' Multiverse: What Mysterio Means for the MCU

Could Spider-Man: Far From Home signal a more politically aware MCU? - Vox

Spider-Man: No Way Home - Wikipedia

Does Spider-Man Far From Home introduce the multiverse into MCU?

Does Spider-Man: Far From Home take place in an MCU multiverse? - Polygon

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

If Sylvie killing He Who Remains opened the multiverse in the MCU, then did it exist during Spider-Man: Far From Home, WandaVision and FTWS? From the perspective of the main MCU universe

Spider-Man: Far From Home' Original Twist Revealed Mysterio as Skrull – IndieWire

Spider-Man 3 Makes Far From Home's Fake Stories A Reality

Disney+ Announces Spider-Man: Far From Home Release Date : r/marvelstudios