I am just going by what AMD themselves said, and they said
If indeed they had another fab player (Samsung), then they would have stated that here (and not use the word all), it is their outlook in their financials, so, it doesn't add up at this point that AMD is doing anything with Samsung's fabs, unless it occurred AFTER 04/21/16. I suppose another option is for GloFlo to ask for Samsung's help, and that could be possible, and wouldn't be mentioned here, but, that is a very long shot, since it would require for them to get AMD's permission to do such a thing.
What all this basically means is, they have all their marbles in one basket with GloFlo. If GloFlo can't meet AMD's order, they will have serious repercussions as stated above.
Engineering samples != final tape out (rarely does).
From AMD Reports 2015 Fourth Quarter and Annual Results.
They would have said it has entered volume production if indeed it would have, but they didn't, so it didn't happen, and again, it wasn't listed in their financials.
It isn't like they can lie about these things to the SEC, if it would have been done, they would have said it.
It also costs lots and lots of $$$ for the orders, and if they put all their $$$ on the GloFlo contract, then, it is hard to get more revenue out of the air.