Probably grityy thing they mentioned is based on bad future taken from Sonic CD, so yeah ... time travel or multiple universes thing.
So, what's this about some guy named David Ellison and his potential for ruining both Sonic 4 and all of Hollywood, for being Paramount's new CEO?

Some are calling him a "nepo baby", whatever that means, and that Sonic 4 is going to be bad because of him. I don't understand why.