The krytonians, Superman and Supergirl, went invisible not intangible.
Their intangibility\invisibility is the same thing. It's the same technique that Flash uses. The scan with Doomsday shows that. He doesn't move out of the way of Doomsday's attacks. He's standing in the same spot the entire time.
And please don't fanwank
Please don't condescend to me or try to write me off as a fanboy. I'm not even a Superman fan. Not that it matters.