It's absolutely fair to call Curry's 2022 supporting cast "amazing". Klay can still be a borderline All-NBA level player on his day and should recover even more next season, Poole should have won MIP by a wide margin, Draymond is a perennial DPY candidate and a really good playmaker/facilitator on top, Wiggins was an All Star starter. Most other superstars in the league would give 5 years of their life to play in a situation like that: 1 clear Alpha and a cast of "role players" of the highest calibre around him that all work towards the teams strengths together.
Lets not pretend that Curry carried a bunch of scrubs, this team is fantastically well built and boasts good depth on top thanks to the Warriors' great drafting. To say it was "all him" and to call Klay, Green and to an extent Wiggins and Poole "pretty good" is selling them short to an unfair degree.
Look at it like this: How many Mavericks players not named Luka Doncic would have even gotten regular playoff minutes on the Warriors last season, nevermind starting? That's the difference between an amazing supporting cast and a mediocre supporting cast right there.
Edit: Since you mentioned Duncan. Same situation: An all time great consistently surrounded by an amazing supporting cast with a coach that got everone on the same page. Parker and Ginobili weren't superstars, but just about as good as 2nd and 3rd best nonsuperstar players on a team get. Same als Klay and Draymond. They weren't the Heatles, but I wouldn't call 2 franchise (in Bosh's case former franchise) players behind a generational monster a "supporting cast". They were Co-Stars.
Oh please god no, not again.