Not directly but trading him to get Lillard was saying that Holiday didn't get the job done as expected. I think he was trying to say that he and he alone was the architect of this team and was the one who would make them even better. The years Holiday was with the Bucks he was in the top 10 for defensive player of the year. They lost all that he brought to the team by bringing in Lillard.
Instead of realizing it was time to trade Middleton before the second year after the championship was a horrible decision. Opting instead to trade Holiday and a ton of draft capital and getting what I consider a lesser over all player in Lillard because of his defense, was a catastrophe. I said, when he did it, the team was not going to go back up to the top because of the poor decisions Horst was making in structuring the roster. By trading Middleton, they could have had increased numbers of draft picks and the cap money available to actually work a couple of deals that would give them even more depth on the bench, where it was needed. All gone because of Horst's ego in believing he was the man who made it happen.
Even the firing of Bud was on Horst. He stripped Bud's power on the sideline and took away the building blocks he needed to right the ship. Instead of admitting he failed, he blamed it on Bud.
Now, don't get me wrong, I was never a Budenholzer fan. When he was fired, and Nick Nurse was available, I thought he was a good choice. Second, I thought they might go with Terry Stotts. Although he was smart enough to bring Stotts back into Milwaukee, he did it to work with a man who has no business coaching a team of 8-year-old kids at a YMCA. Adrian Griffin is a total idiot, and it looks like Horst believed he could "mold him into a great coach as he imagined one." The reality is that's exactly what he did. He brought in his sideline twin, another idiot. Then bringing in Doc Rivers? Gawd! It was all over. Don't expect to see anything of consequence out of this team until it's sold and everything surrounding them changes. Nothing about them spells success any longer.