Basically, cheesing certain patterns and turn them into easier ones (e.g. rolls into jumptrills), works best for very fast single/jump/handstreams
So uh manip isn't cheating (just like what midgy said) but depending on its usage it can be either helpful or detrimental, it becomes detrimental when 1) you get bad ratio and acc for it and/or 2) you use it for streams with BPM that's playable normally w/o manip, leading to bad habits and such
Maybe you might confuse it with pausing, which is cheating*, you recover stamina in an unfair way, and there's no way to technically detect someone pausing via replays
* The example of it wouldn't be cheating would be Kane's zeta clear lol