Earlier quoted context omitted.
It's certainly not the right platform. It'd be one thing if they had any official communication on the matter anywhere else. Maybe they're ashamed and are trying to limit the visibility while only technically issuing an announcement. They announced this exclusively on X.com, which ranks barely above Pinterest in terms of usage. That's below Reddit, Snapchat, WeChat, and Instagram, and requires a user account to view…
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Besides, even if that wasn't a consideration, only posting the announcement to X is just crazy. As others have said, you'd expect for GitHub to make the announcement on their official website. Any paying client would then just follow that for their announcements.