It is.I can see that there might be a discrepancy between the two events such that someone could interpret them as being two different things, based on info from both TOS and TNG. But I'm not sure why such a discrepancy would be so problematic. Again, this is just a continuity error, one of many in the last 60 years of Star Trek. I would think that a whole visual reboot would be far more of a contention point than the date for WWIII.
It's why I treat TMP as separate.

