Thanks for posting the link. I recently discovered what an INTP is and that I am one. I don't believe that I have a mental disorder but I definitely struggle with severe depression and mood swings, I'm trying to figure myself out.
Mediocre source: https://www.youtube.com/watch?v=Q5pggDCnt5M
I don't claim you are wrong, but be very careful about the Barnum/Forer effect when reading such descriptions:
> https://en.wikipedia.org/wiki/Barnum_effect
BTW: I'm personally rather immune to this effect, since I'm not a person who fits "the profile of a typical citizen".
Depression is a (very common) mental disorder. I highly recommend talking to your doctor/a therapist about this if you're self-identifying as such.