I think the AI appears on any SKU with enough TOPS for copilot+ (they released some 200 SKUs that are just Ryzen 5/7, no AI)
Max is the segment number i.e. it's "Ryzen 11" (the other 300 series SKUs they announced are Ryzen AI [5|7] 3xx). Weirdly though there are no Ryzen 9s so maybe it's really just a rebrand of 9.
The Pro just means it has management and security features for enterprise customers.
"AI" seems to have replaced the segment number.
The + is because it's the top-end model of the lineup.
Not sure what's Max or Pro about it though.