why would he reveal it was planned, just gave him more motivation

So what some people will do in fights against another person (not just in mma) is they will do something like distress them to throw them off their game and make them lose focus so it’s easier for the other to overtake them but obviously it didn’t work

Especially knowing what kind of person JJK is, Eminem's little "tactic" was poor thought out and backfired spectacularly XD