Dude, check your facts, Google Home is capable of acting as a Bluetooth speaker. that was enabled as a firmware release a couple of months ago.
"you can use its Bluetooth connection to pair it with more powerful speakers."
I'm assuming the Author is incorrect on this. According to other reviews (cnet) the bluetooth only accepts incoming signals, not outgoing. So the bluetooth is used for connection from a phone, not from the Mini to speakers. Correct?