Raw or frozen lean meat is obviously not "ultra-processed" and it is an optimal source of proteins that are not combined with too much starch or too much fat, as in most alternatives.
Nevertheless there are valid reasons why some prefer other sources of proteins, due to ethical concerns or sustainability concerns.
Moreover, human stupidity has ensured that today there no longer exists any food choice that is free of health risks. Every choice has health risks, so at most it can be assessed that a choice is less bad than the others.
For instance, beef or poultry meat may contain hormones and antibiotics, fish may contain mercury, nuts and seeds may contain lead and cadmium, and so on.