My take in this is that a company that takes pride in their work and really has the ability to produce great products would develop their own flavor rather than calling it "Iberian ham". There is almost always something nefarious behind copying regional products.
To give an example, I've bought plenty of "feta style" cheese over the years and not a single one was as good as real Greek feta. I wouldn't mind buying "feta" by Arla if they produced the same quality, but they don't. There are also sometimes other things to consider, e.g. the Iberian porco preto is free-ranging, and I also prefer it because of that. (Note that many "porco preto" products only contain some percentage, you need to make sure it's 100% porco preto.)
Don't get me wrong, I agree that there should be no reason they couldn't produce great ham in Texas. But if they have a good product they don't need to copy something from Europe.