UHHHH IMO this is definitely not the reason the photo was taken down. Because Johnny posts photos that are 100x more flamboyant than this, and he does nothing to hide his flamboyance. And neither should he hide it. Plus Yuzu has said, openly, that Johnny's style is an inspiration to him because Johnny does not conform to traditional masculinity and does so with confidence. So I really cannot see this to be the reason at all.
And as we can clearly see, people embrace Yuzu and his style of masculinity in spades. In Japan and in the rest of the Asian countries. Yuzu is one of the most popular athletes in many countries other than Japan. So it really isn't a problem.