A Raspberry Pi running Linux with an Apple II as a dongle providing i/o and storage?
I thought at first they were adding the Pi in as a resource under Mac OS (a smart expansion card/video card f.ex).
Worth some geek points for sure, but I wouldn't be interested in (for example) an A600 as a dumb i/o device attached to a Pi running Linux.
I agree. After I posted the OP, I read further. And that looks like all it is. It appears to just turn the Apple into a dumb terminal that accesses an emulator. The little cart they put between the Pi and the Apple 2e slot appears to just be a serial port. We can do almost the same thing with a keyrah through USB.
I was thinking more like drivers on both sides of the connection making the ethernet, memory, usb, and sdcard look like a board plugged into a zorro slot, and maybe even, assuming there's enough bandwidth on that connector on the Pi (probably not), software emulation for a faster 68k on the Pi. That's different from running an emulator and pretending.