I don't find this to be bullshit, restrictions aren't new we've seen the power-up its given to Kurripaca (he can take on the Phantom Troupe). It's been acknowledged previously that Gon has a deep well of power, he's instantly accessed it by placing a severe restriction on himself (said in this episode that he will never be able to use nen again). It's not like anyone can do this, because almost noone else likely has this vast reserve of talent/power.