Has another multiple world champion NBA coach deteriorated as much as POP

I was just thinking of all the players not in these playoffs like curry and Giannis and for whatever reason victor came to mind, The spurs have been awful for quite awhile and POP was the best or at least considered top 2 coach at one time. its like he has had 2 different careers. Goat level success and performance worthy of a firing a few years back.