After the troubles with usb3, the industry worked to clean up the noise on these ports.
So usb c and thunderbolt have the benefit of that prior experience.
To our knowledge, there aren’t significant reports of rf noise radiation and Bluetooth transceiver desense problems with usb c.
You can try your dongle on your new Mac Mini, plugged straight into the neighboring usb 3 port on the back. Let us know if it works fine or if you see anything that needs checking.
Should be ok. Of course, your mini has Bluetooth 5 built in, so you don’t need the dongle to connect, but it can still accept it.