Where the author is correct is that the miners are the chosen ones for writing to the central ledger of bitcoin, but writing to a ledger including transactions, is not the definition of money transmission- the miner would have to take custody - which they do not.
Now where money transmission I believe is running rampant is any smart contract built on ethereum, like uniswap, that is taking custody of any token and holding that token- all of them are violating money transmission laws.