When a meat is properly smoked, there is a pink ring that appears...
...around the outer edges of the meat. That is normal. If the meat is pink towards the center, that is another story.
I don't know what you mean by freezing to ensure it is safe. Freezing will preserve the meat, but only heat will fully cook the meat and kill most of the organisms that will harm you.
If you are suspicious that they may have under-cooked it in order to retain the moisture content, then you have to ask yourself if the meat was properly cooked in order to avoid food poisoning. Low temperature smoking that wasn't carried out properly could encourage the growth of nasty organisms.
Bottom line for me is simple: if I had questions about whether or not I could identify a proper pink smoke ring, I would either toss it or cook it to safe temperatures before eating it.
Michael