“I read it that he was supporting his position on kitniyos, but you might be right, and I can’t see it anymore anyhow”
Yes he was using it to support his position on kitnios but his accusation of disingenuousness was based on (what he perceived to be) compelling halachic support the most compelling of which was the other person’s own psak. (most compelling to the other person)
“I will add, though, and clarify, that if someone is accused of being disingenuous in psak, his status as a posek has been put into serous question.”
It depends who is accusing whom, and under what circumstances, which was my point.