There is more here than speculation, but I cannot say more, so I will leave it at that.
I don’t know why the fact that not everyone is on board makes you so uneasy. Must everything be black and white? I know other Roshei Yeshiva who also did not feel the ban was warranted. And yes, certain signatories advocated for others to sign (as happens, quite logically, with every public proclamation. We do not need every authorative individual to investigate every issue.) But they also made clear the issues they have. So who cares that others have read it (sorry, ALL of it), and are ok with it? Some feel its a big deal, others less so, and others are fine. So what?