I agree. Saw it, too. And Kyrgios is well under the limit 99% of the time, so there's no reason to give him warnings. Warnings should be given if you're constantly just over the limit.I'll say this, Nick was averaging 20 seconds between serves which is higher than usual for him. He was starting the clock very quickly. I watched the match. Not condoning Nick's actions because he went too far. Still, OP may have a point.
I also agree with OP implying Murphy didn't control the match. I know many disagree, because the hate for Kyrgios outshines their reason. But ultimately, the umpire's job is to lead the match according to the rules, which also means treating all players the same way. And they don't.