When we do mathematical calculations, sometimes terms cancel and we get to draw a line through them.
But in the real world cancellations and "total cancellations" don't really happen.
Forces just add. Often there's a big force and one or more little forces, and as long as the big force substantially dominates the little forces, we tend to notice only the big force. But it doesn't cancel, it just covers up the effects of the others to the casual observer.
Let's think about gravity. We are so used to moving around in 1 g of gravity that we don't notice it. You could say that our brain "cancels" out 1 g from our conscious awareness and we compensate for it automatically. We don't feel and notice the 1 g when we stand or sit or lay down, even though we make use of it to stay put.
However, get in an elevator or an amusement ride and add a little acceleration, and we notice it right away! That sinking feeling when a fast elevator starts accelerating downward for example watch (but don't listen to) the video The Equivalence Principle
The purpose of the above discussion is to discount the idea of "total cancellations". A bit of rock or soil on the surface of a body feels the gravitation of the rest of the body pulling down, the "centrifugal force pulling" it up if the body is rotating, and the gravitation of nearby bodies (e.g. Sun or Moon or planet) pulling up or down or sideways depending on orientation. It feels all of these all the time.
If the net force, the sum of all the forces, pulls up, then the body starts to disintegrate. If the net force is still down, it doesn't.
Think of it as a threshold, rather than a cancellation.
...if that's so, ¿why does the body deforms even before crossing the Roche limit?
As long as the body is made of material capable of deforming or flowing (which rock certainly is, especially when hot) then it will continue to move or flow until the sum of all the forces reaches zero. Gravity usually dominates, but it's the force of the compressed layer below pushing up that counters the sum of all the forces.
If the body is rotating, then the net force is weaker on the equator than at the poles, and so less pressure is needed to compensate. That means the higher pressure at the poles will cause some of the material to move to the equator.
To read more about several of the competing forces pulling on us all the time as we stand on the Earth, see:
Once you are comfortable with the idea of equilibrium, multiple forces adding and pressure, then have a look at all the interesting answers to these particular Roche limit-related questions: