> The most relevant part is:

That's actually not the most relevant part. The most relevant part is "We will now begin disabling installed extensions still using Manifest V2 in Chrome stable. This change will be slowly rolled out over the following weeks."

Google had already started disabling Manifest V2 extensions on pre-stable channels, prior to October 9.

The first paragraph is "what we've been doing." The second paragraph is "what we'll do now."