alt Hacker NewsThe 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).
MV2 is behind a flag for now, but it is about to be removed from the Chrome codebase entirely. Which is why Brave recommends using Brave Shields as the long-term solution, which does not depend on it.