As soon as I saw this was advertised as a bitcoin miner

something started to stink right away cause you will never ever mine any btc on an < 5W device successfully.
I think you already got it figured out. Bitcoin can be mined by ASICs not some shitty network antenna.
And the token they talk about is MXC, an ERC20 token on Ethereum network. I wonder how mining an ERC20 token works out

This post should be moved to mining (altcoins). it doesn't belong here.