Anyway, it's nice to be an INTP poster child, I guess. Regarding the post being referenced, I don't believe that I, personally, start moving toward any J characteristics (negative or otherwise) when stressed. In fact, when I get really stressed, I just shut down, become paralyzed, and stop taking any action at all. I just get very passive and resigned. If anything, I'd say it's like an extreme, unhealthy P characteristic.
But other INTPs may react differently. While I have no doubt that I'm INTP, my reaction doesn't necessarily represent the breed. I'm very non-aggressive (is that a passive way of saying "passive"?), and I really hate conflict, or having anyone upset (even if it's not directed at me). I have a high enneagram Type 9 score (calmness), and very low Type 8 (aggressiveness). A lot of INTPs will occasionally "rage", where they really go into a fit of anger. I've never done anything like that. I don't really do anger. I don't know how. I probably should.