All of their mechanical CAD? No- some of that is handled in Shapr (https://www.shapr3d.com/). Given the state of the industry and the discussion in many sibling comments, it wouldn’t surprise me if this share is growing. A little birdie tells me they work closely with the Shapr team on certain feature developments in the app, and from my own personal experience I can tell you that I much prefer the Mac-native modeling experience than any of its gargantuan antiquated peers.