The Arlo is dhcp only. There isn't even a way to set an ip at all with it. You plug it in (the base station doesn't do wifi) and it grabs an address.
The address isn't used by anything else. I even tried giving it a static assignment using it's MAC, and while the Pi-hole will then assign said new address the same problem persists.
If I switch back to my router's DHCP it comes right back.