Even though this position would not be possible in a game, is white winning?

The strength of a piece is based on mobility, not its ability to capture.  To have more than double the knights as queens is pointless unless you're under the impression the queens can capture 2 at a time or some nonsense.

but with 8 queens, black has 72 points, while with 23 knights white only has 69!!!

I'd say that puts white in a good position.

Yes, defintely!   Black can get nowhere near White's King.  White can just leapfrog his Knights over each other and will eventually get in several forks to gain a big material advantage

Very easy win for White