I don't think it's neccessarily BS. Most all DC fans have known that Post-Crisis inconsistencies...including 'Zero Hour'...were a result of aftershocks of the original Crisis. They are simply making it into a story and a legitimate explanation with IC. I don't think they are trying to pull the wool over anyone's eyes and say "Oh yeah, we've had this in mind for twenty years now". I think Johns and everyone involved simply allowed fans to create the explanation for poor editorship, and are now using those explanations as the crux of revamping the DC over again.
It's almost like they are legitimately admitting that they fucked up Post-Crisis from the start, and are warning that they might doing so again. At least, that's what I took from it...
