Source Page. Credit is to SMBC-Comics and even more credit to @aperson@beehaw.org who noticed it was missing and found the credit in this comment. Sorry about that and thanks, you're awesome aperson <3
That's about consciousness, which is a much larger claim than the self being an illusion. You can have consciousness without a self, that's what we call ego death. In theory, a conscious being could exist that's always in a state of ego death, and have no understanding of the self and be utterly confused by why people find anything unintuitive about the teleporter paradox.