This is a proprietary core from a hobbyist/retro mainly Amiga team (nothing to do with Motorola) that has had quite a lot of murkyness associated with it.
There have been accusations of this being simply a Coldfire ripoff based on leaked information [1] but also a lot of people have complained that they delete critical posts from their web forum and discord.
The core is buggy and not really fully compatible with Motorola processors. They've also implemented their own extensions (AMMX). The Amiga scene has had countless peddlers of proprietary hardware, trying to vendor lock-in a substantial userbase. My opinion is that people are better served with Mister FPGA which is completely open and/or other open solutions (The Buffee project, PiStorm).