Browns combined the right and the left into a political leadership over the country, Shea is speaking of bolstering the anti-war movement's numbers and thus power with the right instead.
"that “these people aren’t interested in liberation, they’re only out for self and for kin.”"
This is not how he comes off to me but you are entitled to your opinion.
"I am still not convinced that concepts like Haywood’s Black Belt Republic aren’t the direction my folk should be going in"
Black Americans do not have the numbers to accomplish such a task as a Black Republic and hold it without the US bourgeois state along with the Canadian lapdog seizing the land back. This just isn't realistic. If you want your people to be free, socialism is the best way to achieve such goals because it takes into account the interests of all workers equally. It does not cater only to the needs of black workers, no, however this is not something Marxism aims to do.
"definitely won’t long-knife y’all when your usefulness is through”, that tells me that your movement is predicated on anyone else’s sacrifice but your own, and leaves me considering you as deeply unserious to the point of being literally hazardous to any oppressed folk in your orbit."
I understand your distrust however I remind you that even utilizing race relations analytics defensively is still viewing the world on terms of race. Marx shows us that method of analysis is useless, it is one which serves to create and then re-enforce capitalism.
Oh they're here. They're to us in our spaces as MAGA is to mainstream neoliberal spaces - they invade to sabotage, they seek to destroy. We could move to Mars and they'd send space drones with propaganda blasting from speakers.