He resists his own fear hax
There's a reason why characters like
Hajime Nagumo can have vs matches without his passive fear + madness hax making the match not happen.
The scan y'all asked me to look at already said the fear hax frequently leads to insanity, this means if you already resist the cause (fear hax) you're not affected by the result (insanity). When I mentioned immunity I was Immediately questioned on it's validity prompting me to bring the scans where it's stated so I believe it's not too much to ask of you to bring scans supporting your line of argument