Unfortunately, he is. When is the last time a team won anything of note with their best player pushing 40?
KD has averaged ~55 games since his Achilles tear, not 65. He did play 75 game two years ago, so there’s that.
KD in the playoffs with Brooklyn, 32/8/5 on .602 TS%. With Phoenix, 28/8/5 on .612 TS%. If you replace his production with Jalen on last year's team, the Rockets at least make the WCFs.