No, you're correct. The dongle needs to be connected the USB port of the printer. There's one built in the front of the printer especially for that purpose. Still haven't gotten around in trying the DiNovo dongle though, but I also have my doubts if it'll work.

On the other side, you're obviously correct also. The range of Bluetooth is so limited, I could just as well walk up to the printer and connect the USB cable. But, more than anything, this 'problem' for me has become a challenge in 'beating the system', without giving in, in this case: printing while connected to VPN without having to move the laptop to the printer. Hmmm... maybe wireless USB is an option.