How do you know this is why he scrapped it ?
It's kind of obvious. The critics where all on his d!ck. But if you really want to get all verbatim about it, according to him "He canceled it". But if you take that and put it in context with him wanting to retire and the critics on his d!ck. You can a.ssume it has to do with him wanting his next album to be received in a totally different light and not have to be compared to the original F and L.
The only interview where he talks about F and L 2 part 2 not being released