I think it can depend on who he is beating and by what scores, yes?
I know my friend only lost once at the 4.0 level in singles, and a lot of the time crushed his opponents 6-2, 6-1, etc. and he didn't get bumped up. But, those "crushings" were against 3.5C ranked guys, and he's expected to do that. Against 4.0C guys his scores were much more competitive (with 3rd set tie breaks thrown in).
2" from being an excellent tennis player!