...who affected Dustin Diamond very badly is not fake.

It is more likely revealed to be a prostitute (female or male) who lured him in a bad trap really badly, after the new class series ended in a hurry with a weak finish.

Whoever that prostitute, that lured Dustin in a bad trap, may have played tricks on him by writing that book "Saved By The Smell" in order to create revenge on the other main cast members of the original class, who act too difficult on him.

I think the original class producers and writers should be blamed for being too in a hurry making the original class difficult and including both Dustin and his Screech role in it at the same time.