Wow thats new to me and to be honest quite shocking.
He never was the most likeable guy around but I didn't expect something like this from him.
One of the reasons he fell out with Zorc, Watzke and Rauball at Dortmund was Tuchels behaviour after the attack on the player bus prior to the match against Monaco (
https://www.theguardian.com/football/2017/apr/11/borussia-dortmund-explosion-team-bus if you forgot it). Tuchel seemed really sensitive about the topic and said he doesn't want to play the match just one day later because of what the players had experienced. Zorc, Watzke and Rauball however stated that the match should be played regardless of what has happened.
But well, maybe he only cares that much if it effects his own team?