Thats what i figured, but we dont even have a C64 forum here. I'd imagine the link from the original C64 to the original amiga would be a lot closer than the link from the 64x to whatever is considered amiga now.
You can run aros or uae on the c64x, so technically the 64x is more ontopic than an actual c64.
breadbox 64 is cool, I only don't use mine because it has a fault while my c128 is solid.