Social anxiety isn't actually seen as being about "real risks" inasmuch as being embarrassed or disliked is not likely to kill you. If you are dealing with a social situation that is likely to result in harm or death, it's not classified as social anxiety. So yeah, the competency for treating somatic symptom disorder would explicitly include knowing about the disease(s) one's clients have so they know what's "normal" or "proportionate" and what's not.