https://www.nba.com/stats/players/clutch-traditional/?sort=PLUS_MINUS&dir=-1

What filters are you using? He's 43rd in +/- per game during clutch time according to NBA.com.

Even if you limit it exclusively to players who've played 10 or more games that require clutch time, he's Top 10. And 3rd on his team in that metric, behind Daniel Gafford and Deni Avdija.

Or maybe you're arguing for total +/-. Cool. He's 4th in that metric, behind Chris Paul, Jae Crowder, and Mikal Bridges.

Here are screenshots for those who don't feel like dealing with NBA.com on mobile:
https://imgur.com/a/3XPbnpC

So I assume you're using some sort of filters and restrictions to make Kuzma #1. Would be interested to know what those are.

Or you're arguing that Jae Crowder should also be an All-Star and that he's Top 25 in the West. I don't know.