I swear I remember seeing that asked before, and the answer being that it wouldn't be a great look.
But really, it's not an either/or. If Hazou used a Jiraiya goo-bomb to trivialize a fight against someone he could have fought normally, then that's not a great look. On the other hand, suppose his opponent has some cheat bloodline/technique that would make it impossible for Hazou to fight them normally? Then using a goo bomb to cancel out their cheat is just "doing whatever it takes" to win, and it's his opponent who has to prove that they can find a way to win even when their normal trump card gets canceled.
Basically, my take is that the greater the initial power disparity, the more Hazou gets forgiven for resorting to 'cheats' to win anyway. Like, if he had to go up against jinchuriki in the tournament, then sure, whatever advantage he can manage!