I think Roux is afraid the experts will discover what we already know-- OP IS A PATHOLOGICAL LIAR and a person completely lacking in the most basic empathy for other human beings.
I don't think they care about narcissism or borderline --They are afraid he will be found to be a sociopath or even a psychopath. It will be hard for him to hide his complete contempt for anyone who imposes on his will.
Refer back to Jodi Arias. She refused to allow her DT to raise a mental illness defense or to even acknowledge problems other than the imaginary PTSD. Casey Anthony went ballistic when her attys even brought it up to her.
Consider the possibility- I'd say probability- that it has been OP, not Roux, who has opposed psych evaluation.
Nothing convoluted there at all, IMO. I bet Roux is relieved.