No.
Discord continues to be blocked in any location other than the Social Media features. The array in AllowedExternalLinkReferences is only for references. In the case that you have an whitelisted external reference in your game, say Twitter since that’s not banned (promotional codes or promoting your page itself), you can use this reference list to turn it off for a player because their country does not allow that link by policy - provided you launch your game there.
You should wait for more information regarding the Global Compliance System as PolicyService has not been fully rolled out, as far as I know. Be sure to check the Announcements category for more information about Global Compliance and the Developer Hub for other documentation. Mentions about lifting the Discord ban have not been associated with any of the Global Compliance System thread(s) however, which is what PolicyService is primarily for.
More information for developers who don’t know what PolicyService is:
Another discussion thread:
https://devforum.roblox.com/t/using-policyservice-to-determine-if-you-can-show-a-discord-invite-to-a-user/517172