Beta progress carry forward

Heyo I'm sure 99% that this is wrong information but within the last ~7-10 days I somewhere heard or read that especially in Zombies the progress we make in Early Access and Beta will carry forward into the main game, since this never was the case before iirc, I'm almost sure this isn't a thing but wanted to make sure and ask yall Also if it's should be true, which progress will carry forward? And my last question is if it's true that the Zombies access will begin a day later (Oct. 3) and end 1 or 2 days sooner (Oct 6 or 7)?

Sorry for bothering dont wanna read 5 whole blogposts from CoD 😭

Thank you very much in advance and have a great day y'all!