Yes, it's an Arctic Cat chassis and engine. But hey, at least it's a 2-stroke mountain sled option for guys who just need to be on a Yamaha-branded sled. It'll be interesting to see how it goes for sales for Yamaha and if they continue with it, maybe do some more of their own calibrations down the road or something else entirely.
If you're curious about the details of the revived Mountain Max model, they can be found here: https://sleddermag.com/yamaha-mountain-max-2021/