To the Nazis that were kicked off or fled when Twitter had decent moderation to let them know Nazi conversations are flowing like wine and they're welcome back.
Rephrasing for people who will react negatively to that. You're making an important point but "dog whistle" assumes some things:
Those are people speaking abstractly about how much more free their speech is*.
I've never heard that common phrasing used, in any setting, to refer to a change in Twitter user makeup, or it becoming a kinder place. Whether I'm in the company of team left or team right, and coding as same team or opposite team.
* yr humble author refuses comment and does not endorse this viewpoint, or that anything changed on this front