I've read all of Pynchon's books and a lot of books whose authors were clearly inspired by Pynchon, and I don't see any reason to assume this doesn't fall into the latter category, especially after reading a few pages online. For one thing, I think it would be the first Pynchon novel written in the first person. The prose also seems markedly less lyrical than Pynchon's.

I mean, if Pynchon put his name on this, I wouldn't say, "I disbelieve this, he must be attaching his name to someone else's work," but I would say, "Huh, he really changed up his style for this one." But he didn't put his name on this.