it's not a theory, that's the truth, in SIV, Lois tells Superman that she remembers everything. Therefore, the Superkiss, is something that fanboys have made up to complain about. It does not wipe someones memory. As you said, she chooses to keep the secret.
As for the new franchise, it is yet to dispell the so called superkiss b/c it hasn't started yet. Coupled with this are the elimination of SIII and SIV from the continuity (in which the superkiss is debunked). So it remains to be seen what they are going to do with this concept, if they are even going to touch upon it at all.