But wouldn’t a person asking to see such a record to render service be a HIPAA violation?
Nope, HIPAA is concerned with violations committed by others who share your information without your permission.
Any person can ask another person anything, the other person can respond positively or negatively to the question/request.
I suppose people could refuse to supply vaccine info to a potential employer and try suing them for requiring it for a job, but that isn’t HIPAA.
https://www.hipaajournal.com/what-is-a-hipaa-violation