I really hate Diamond sometimes.
Equestria Daily has received confirmation from our friends over at IDW Publishing that—despite what Diamond has posted on their PreviewsWorld Webpage—the release date for My Little Pony: Friendship is Magic #89, and thus the beginning of Season 10, has not been rescheduled for November 4th, 2020.
IDW Publishing currently doesn't have any confirmation on their end with regards to the release of this issue (and the launch of Season 10). Because of the COVID-19 Pandemic, everything is still very much in flux.
As such, we shouldn't put too much faith into any release dates that aren't announced by IDW Publishing. Equestria Daily will keep you update for when Season 10's launch date updates.
Twitter: The Illustrious Q