Apparently there's now a sixth person on Anthropic's board. Previously their certificate of incorporation said the board was Dario's seat, Yasmin's seat, and 3 LTBT-controlled seats. I assume they've updated the COI to add more seats. You can pay a delaware registered agent to get you the latest copy of the COI; I don't really have capacity to engage in this discourse now.
Regardless, my impression is that the LTBT isn't providing a check on Anthropic; changes in the number of board seats isn't a crux.