I find frustrating that this type of product (like the MSX VR some years ago), don't specify clearly what are they selling. Is it an ARM SoC? Does it have a Z80? Is it implemented with a FPGA?
Yes, it says "OneChipMSX" https://www.msx.org/wiki/1chipMS but IMHO it could be clearer.
If you go to http://www.8086cpu.com/MSX/103.html there's more information, but it definitely puts me off when considering one of these devices.