ITSV is Bendis more than anyone. The only thing from Slott is the title Spider-Verse. The movie doesn't feature any of the characters he created like Cindy Moon or the Inheritors.
Spider-Gwen is Jason Latour and Robbie Rodriquez and wasn't by him at all. Spider-Ham is Tom Defalco. Sp//der is Gerard Way and Jake Wyatt. Spider-Man Noir is Carmine Di Giandomenico, David Hine, Fabrice Sapolsky.
The movie's based more on the Spider-Men crossovers, Death of Spider-Man, and the Miles Morales origin and Prowler arc than any of Slott's stuff.