You're spot on. At least we have some info on this one.The true root cause for the pump failure could be foreign particles were left in the cooler or trans itself. Perhaps from an insufficient or missed flushing step after manufacturers machining operations. I have even heard of sand left inside of castings. The OP will likely never find out about the root cause and frankly it doesn't matter to anyone except FoMoCo.
Bad oil pump is more info than some people have on blown engines that happened over two months ago.
Just glad it was taken care of by Ford. In the end that's all that matters.