As a Roblox developer, it is currently too hard to know when to disable in-game Twitter promotion. AllowedExternalLinkReferences includes all social networks (Discord, Twitch, YouTube, FaceBook) except for Twitter.
I’d be careful with making assumptions like that – if they ever add Twitter to this API and someone is still running this code, and for some reason a different country has different restrictions on who can view external links, that code will lead to incompliant behavior for those countries.
It’s safer to just not show Twitter links at all until they have the policy API for it, or only do this for active experiences that you frequently update so you can react quickly.