Do any vehicles listed on IMCDb.org have anything to do with model years that can be before the actual calendar year even in terms of release dates, delivery dates, and maybe entry to service dates?

Do you have a memory loss? You just asked the same question a week ago and it's right there as the first listed subject in the misc. section. It seems like you didn't even bother to read the replies. Please check the replies on that page and make further comments there. I'm deleting this subject after you've read this, as duplicate subjects is a violation of forum rules.

I accidentally posted it twice, but I deleted the duplicate post.

No you didn't, it's right here:

https://imcdb.opencommunity.be/forum_topic-9628-84980-Model_years_vs_calendar_years.html