It seems like releasing more would have probably broken the exact same rules they are claiming AdaFruit broke.

if they didn't want to say more, they should have said less.

the way that normal serious businesses handle situations like this is to simply stop carrying the product, instead of publishing vague, unverifiable accusations of wrongdoing. and then if somebody notices and asks questions, you'd give a statement like "unfortunately we could not come to an agreement to continue our relationship with this vendor, but we're happy to be able to continue offering a number of other comprable products".