It's a bit complicated and it depends on what exactly you're measuring. The 68000 CPU has 32-bit registers internally, the address bus is 24-bit, and the data bus is 16.
This is so for A500, but the definitive Amiga is A1200 with 68EC020, AGA and only limited by 24 bit address bus (=16 MB ram). From that on people just installed 030 with MMU and later PPCs if they wanted.
Interesting that you see the definitive Amiga as being the A1200 - the definitive one for me was definitely the A500/A500+ - it was definitely way more popular!
BTW, I don't think the software in this repository is compatible with PPC-based Amigas, is it? (Unless they have the add-on board that runs a 68000-series processor in parallel?)