What Earth is the Madame Web film in?

I have done a lot of digging and everything I find says that the Madame Web Film exists on Earth-688(B), yet the director says that it's in it's own standalone world. Isn't that a contradiction? “Meanwhile, in another universe…” In a switch from the typical genre, Madame Web tells the standalone origin story of one of Marvel publishing’s most enigmatic heroines. The suspense-driven thriller stars Dakota Johnson as Cassandra Webb, a paramedic in Manhattan who may have clairvoyant abilities. Forced to confront revelations about her past, she forges a relationship with three young women destined for powerful futures…if they can all survive a deadly present.” That's another blurb I found. It's all well and good if they are using the idea of multiverse to explain away inconsistencies (as has been the case in comics and media adaptations for a long time now). That said, it's a contradiction as the SSU is designated as it's own Earth. Is the Madame Web film a pocket universe within Earth-688(B)?But then isn't Earth-688(B) a pocket universe of Earth-688? So it's a pocket universe of a pocket universe? Is this just an oversight on their part, or am I missing something?