Yeah I'm a little puzzled too as to the doubt here. It contradicts nothing, and if anything it being in a Secret Origins issue only compounds its canonicity, as opposed to calling it into question. I don't see any reason why anyone would assume Pak was confused here and did something he really wasn't supposed to.
His parents successfully hid his powers as a child then he himself juggled a dual identity in his teens in the classic tales. This is a non-issue. The fact of the matter remains that in this continuity he had at least enhanced strength as a baby, and was never caught. It shouldn't be that hard to suspend one's level of disbelief for that. And even if you can't, its official either way.almost impossible to hide. Kids rarely known their own limits and do things on impulse. Clark would get discovered really easy