If Andrea Vallinotto succeded in realizing the AmigaOS on Mac Kernel, then HE IS THE BEST PROGRAMMER EVER...
He who made this loader deserves all our RESPECT!
He realized what none believed it was possible... Running AmigaOS on Mac!
Who exactly believed that it was not possible? In fact, many people were saying it was very very very possible and certain OS4 developers were saying that it's too much work without docs, difficult, etc. Perhaps you did not believe it was possible.
Anyway, I am not about to claim that I could port it myself, but best programmer ever for porting the AmigaOS 4 boot loader to Open Firmware and adapting the HAL for the Mini's hardware is not exactly an insane programming feat. In fact, it's exactly why the OS has a boot loader and a HAL in the first place, instead of being tied to the hardware and firmware.