It's the same as the Pi accelerator for the BBC Tube interface, or the one you can add to the ZX Spectrum Next, or any of the dozens of other 8/16bit microcomputers to which it has been added.
I don't see the problem - it's a neat solution for when you want to use the bulk of the original hardware, but want a faster processor (the options for which are pretty limited and/or expensive for those systems, whereas the Pi is dirt cheap). It's only replacing the 68k core, which has been extremely well emulated for a couple of decades now, so it's not like it has to to the Amiga chipset with all of it's peculiarities and quirks.
My collection database and technical wiki:
https://www.target-earth.net