First of all, certification advice is NOT the same thing as consultation for a medical condition, full stop. I fail to see how letting the group know that someone who has approached him for certification advice is a liar will discourage anyone from seeking MEDICAL help.
Yes, confidentiality still applies of course, as to MEDICAL information, but Bruce has revealed NOTHING of a confidential nature.
It's also possible the OP reached out to him informally, without engaging his services. In that case there is NO formal relationship between Bruce and the OP.
My money is still on Bruce having this OP confused with someone else, and that in the thread he's thinking of, the OP was ducking responsibility in a way that was clear to all. That has happened several times before, and he has apologized. Bruce sometimes mixes threads up, especially in late evening posts (see the timestamp, roughly 2300 CDT).