Does he gives negative outcomes always?
In my experience, yes. Lol he's a tarot reader, but I feel like he even gives positive cards a negative spin. He was accurate about my relationship at the time, but I've come to understand a lot more of the nuance of the situation (in a way that's very positive for me) that Tristan totally glossed over or ignored in favor of negative outcomes.
Once I started to understand that, I went back and asked him about an upcoming performance review at my job. One of my supervisors told me (unsolicited) she had submitted a review so glowlingly positive that it might actually embarrass me - I don't normally "test" readers, but that just felt like the perfect opportunity to do so. When I asked Tristan, he immediately zoomed in on criticisms. When I said that was interesting and if that meant it would be an overall negative review, he said he drew Justice and "there will be good comments in that review as well, so perhaps not negative really, more like balanced I would say." Personally, I felt like he was hedging his bets, and she probably did include constructive criticism, but the way he immediately picked up and focused on the negatives was enough to keep me from reading with him again.
FWIW, the other person I tested was Eve Light on Keen, and she was accurate.