Board Thread:Naruto Discussions/@comment-46702312-20200902014722/@comment-6769189-20200911222052

I dont recall it ever being outrighted stated that the Rinnegan itself grants immunity to I.T. It was suggested/theorized that it was, but correlation=/=causation.

The Susanoo being able to block IT wouldnt make sense as it isnt a Rinnegan Jutsu, suggesting that the Rinnegan users chakra has properties that block I.T., not their eyeball itself. And as we know, obtaining the Rinnegan also means getting 6 Paths Chakra.