No. Recent version of AutoCAD are customizable via .NET and core libraries that ship as part of AutoCAD are written in .NET too. If you have AutoCAD installed look at HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R18.1\ACAD-9007:409\Applications, all of the sub entries that have a entry MANAGED of Type REG_DWORD with a value of 1 are .NET extensions. With that being said they either have to ship Mono with the Mac version or rewrite a ton of code in C++.