Its already disabled in PS preferences.
I would also like to know the answer - I really dislike animated zoom.
Turning off the GPU in ACR Prefs will change how zoom works.
I see you're right.
Unfortunately that means I have to choose between getting "Performance Improvements Camera Raw can now use the Graphics Processing Unit (GPU) to speed up interactive image editing. The GPU is particularly helpful when using high-resolution screens, such as 4K and 5K displays." and unnappealing 'animated zoom'
Hopefully ACR Prefs will be updated in the future to include customisations of the 'Use Graphics Processor' preference.