The other Autodesk products use DirectX rather than OpenGL on Windows since years back. Apparently a big reason for this was the sketchy OpenGL driver support o

The other Autodesk products use DirectX rather than OpenGL on Windows since years back. Apparently a big reason for this was the sketchy OpenGL driver support on Windows, which caused issues with many consumer-level graphics cards. So this is not necessarily an issue with Apples deprecation of OpenGL, but could as well be Autodesk wanting to move also the Alias product to DirectX only.