alt Hacker News(Reposting my comment from below)
Brave said they'll try to maintain temporarily limited MV2 support for only 4 specific extensions, but recommend Brave Shields as the go-to adblocker for the future. Google is about to remove most of the MV2 code from the codebase, which will explode the complexity soon.
The word "temporarily" isn't mentioned anywhere on that page, and that's already a very different claim to "Brave is about to shut down MV2". And the MV2 support is not specific to those 4 extensions, the hosting on Brave's servers is (though for other extensions not that much changes with MV3 anyway).