Every flush treatment (at least the majority of them) have 2 aims:
1) Don't kill any microbe & myco
2) Disolve retained salts in the soil and make them free for be drained or used by the plant in the latest stages of their life.
So, they don't destroy anything, only make the salts soluble again to get the clean you want or to help if you've a high salt toxicity in your medium at any point.
But you should'nt add it with nutes, if you want to improve the uptake and avoid a lockout of nutrients to your plant you should get enzymes, you've many products here and there, it depends of the quantity and quality of those enzymes to get the best out of them, so imo sensizym is one of the best products in the market for that purpose