Don't worry I'm still lurking here.
So what you're asking is if, for example, frame 8 of kirby's f-air is the same as frame 11, and 14, etc.? The answer is yes. A look at Toomai's spreadsheet will tell you so. It's basically frame by frame execution of code :
After 8
Set Flag 30
Hitbox 0
Hitbox 1
Begin Loop 6
SFX [19] [219]
Wait 2
End Hitboxes
Wait 1
Revive Hitbox 0
Revive Hitbox 1
End Loop
SFX [19] [219]
Wait 2
End Hitboxes
Hitbox 0
Hitbox 1
Wait 1
End Hitboxes
Set Flag 0
-
I don't know what flag 30 is for, but you're right when you say it's a loop and it revives the same hitboxes (0, and 1). AND you also have fair landing data in the same spreadsheet. For most of the characters, the landing data only contains sound and graphical effects but in the case if kirby's fair (and jiggly's dair and probably others) there are also hitbox data. When you cancel the aerial, these instructions (sound, graph effects + hitbox in the case of landing hitboxes) won't be run. By taking a quick look at the spreadsheet, you can identify which aerial possesses landing hitboxes.