This is correct, but there are a couple of caveats.

As a reference - relays https://metrics.torproject.org/userstats-relay-country.html?... - bridges https://metrics.torproject.org/userstats-bridge-combined.htm... - ticket https://trac.torproject.org/projects/tor/ticket/20348

Noteworthy "I messaged the user my unpublished obfs4 bridge whose OR port is firewalled and the bridge is working so far". Also, the boxes don't seem to perform a good job in inspecting for protocols tunnelled over HTTPS (https://gitweb.torproject.org/pluggable-transports/httpsprox...).