TH is a little slow on getting to this, but they did get to it
From what I understand, yeah... the non-exclusive boast only seems to apply to the non-gaming cards. i.e. "you can release all the GPU cards you want of brands x, y, and z along with "ours," but when it comes to your gaming line, you absolutely must side with us, and only us" type thing, while promoting loudly the non-exclusive part.
Just like the HardOCP piece, you're going to have a hard time finding someone going on record (for whatever reason.) I assume for fear of breaking NDAs, retaliation, or some other reason that could hurt their bottom line. AMD has them nervous, and they are ready and willing to enact anti-competitive practices to ensure they minimize real AND potential damages.
Some are already dismissing this potential anti-competitive activity and its half-truth non-exclusivity statement. Partly because AMD shopped it around, and that the HardOCP piece said there wasn't solid evidence provided. (Well, there was enough to suggest further investigation, but not enough to actually call them on it.) Also, some are willing to ignore the reputation of HardOCP just because nobody was willing to go on record, but divulged info under the condition of anonymity. Part of it is also the fan-boy aspect refusing to accept that NVidia is nervous about AMD, even though their best this last round wasn't enough to beat the GTX 1080Ti and the Titan series.