I'm starting to think the thing I mentioned earlier about it being in a loop (from what the Pi-hole mod said in the Reddit thread I pasted earlier) is what's happening here, but I don't know how to fix/change/affect that.
Pi-hole is receiving the Brother's query via the USG, and then because it's a localdomain it's then forwarding it on to your router as per my CONDITIONAL_FORWARDING settings, which I do have set.
Does that make sense here?
If you run nslookup, you circumvent the local hosts file on the PC!
Not really but I dont know everything 
Why not do below ?
So I tried uninstalling all of the Brother software and it's actually still being queried in Pi-hole. Weird. I thought for sure it was the software doing it.
The name "brw0c" seems to be related to Brother:
Yeah, I mentioned a few times it's a Brother printer. Mine prints right away, though.
I just wanted to take away doubts about who is querying.
Maybe better luck at a Brother oriented forum/support.
Hi,
Have the same problem with my Brother printer & label printer, receiving querry 3 times/minute.
Have you found any solution?
To test I turned off my printer and label printer, reset Pi-hole logs and the querry keeps comming so is's the driver/software who's sending the querry. I'll test with wireshark to confirm.
Update: I can confirm it's the driver who is sending mulitcast
I've putted my BRN* hostnames in my hosts file pointing to the IP of the printer and the querries are gone, so this proofs for 100% it's the driver who's quering the BRN* hostnames to know their IP adresses, but by defining them in the hostfile broadcast no longer happens.
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