You think precarious workers are no longer on twitter because of musk and some exec no ones ever heard of?
No, I don't think passive scrollers are no longer on Twitter. But I know active people that actually engage and support causes they care about are no longer on Twitter.
And secondary to that, unions are invisible on Twitter due to policies and algorithms set by current Twitter leadership. Best example of that being you can't even see posts without being logging in into an account anymore.