With all due respect I read the entire issue and I would say that saying they are parts of the original heroes in that Lois and Clark from the New 52 are part of the Post-Crisis versions is a bit of a stretch. For one this was a dream sequence and they didn't confirm either way where it was that they seemingly came from. So the jury is still out on that although it would make a lot of sense given what we have seen in the past in the likes of Infinite Crisis of heroes being split apart and put back together.
Just my two cents.