The warning clearly states that the games won't be accessible on Steam from September 1st, 2022. Currently, there is no information if the owners of Ubisoft Connect versions will also lose access to their games.
Do you think Ubisoft can pull a stunt like this? Gamers have never encountered a situation in which a single-player game became unplayable after delisting it from the storefront.
Yohoho, mf.
There are laws in many countries that address this very thing, though i would hazard a guess that this is still a legal grey area and if Ubisoft insists on making the games unavailable to people who paid for them we're gonna see it get tried in the EU and the US.