'Fraid not, "MAX" may have meant all gear when it was first announced ( am not 100% sure) , but it does not mean that newer gear models are automatically added to the bundle (other manufacturers have a similar approach).
The gear provided in AT4 MAX is listed here
https://www.ikmultimedia.com/products/atmax/index.php?p=gear "With it you get 80 amplifiers, 92 cabinets, 29 speaker models, 88 stompbox effects, 24 rack effects, 19 mics and 2 tuners".
Dimebag is very new, and, yes, as that gear is not included in AT4 MAX, you would need to buy the bundle or individual pieces of gear.