Board Thread:Questions and Answers/@comment-31215960-20171212161449/@comment-1013969-20171214160715

The problem is in 1987 (when Batman #410-411 came out) DC didn't really have a handle on how Crisis happened in the Post-Crisis DCU. For example, Post-Crisis Superman remembered meeting Earth-Prime Superboy during Crisis. which Post-Crisis should have been impossible.

More over all the issues you just cited are post Hypertime and therefore tell us next to nothing about the Post-Crisis (1986) Per-Zero Hour (1994) version of Crisis. Heck, came out the same month hypertime was formally revealed (Feb 1999) and it recounted the Pre-Crisis version of Crisis.

If that wasn't enough during Zero Hour itself Brainiac 5 revealed that Pre-Crisis events had (somehow) happened in the post-Crisis continuity  The end of Zero Hour wasn't any help as the timeline expressly stated that Crisis on Infinite Earths had happened 4 years ago and even showed five Earths. Then DC got the bright idea of implying that all those realities seen during Zero Hour actually existed as part of hypertime.