I agree, that would be more authentic. Or rig up an actual line printer.
But I think the fuzzy old terminal emulator at full screen gives you a more accurate view of an old curved, flickery, low-res screen.
Event a TTY on a modern screen is going to be higher res (far more than 80x24), nice crisp fonts, colors, etc.
One way is to run Pi-hole’s admin interface on a different port. That’s configured in:
Set:
server.port := 8000
Then your URL is http://IP:8000/admin