Probably not. SSK's shtick is not true regen neg, it's moreso a limitation of the RCT of the user. RCT is slower when trying to patch up the soul, but it is more than doable as long as the RCT user knows the shape of their own soul.is all soul damage regen neg or just SSK
Yuji's thing isn't or doesn't really seem to be the same way. Narrator didn't stress the same thing.