Thanks for highlighting that here! It’s true that self-hosters who are only updating now will have to take action if they are using any of the affected plugins already. But for customers hosted by us no action is needed and there is no change.
The list of affected plugins and what to do is all explained in the topic the announcement links to so do recommend self-hosters review it. If you have any questions or concerns about it, please reply there: Bundling more popular plugins with Discourse core