will ConfluxEnabled 0 disable it for tor acting as a client only or for relays as well?
Yes, it affects relays as well, not just clients.
Due to the high frequency of bug events related to conflux, especially: https://gitlab.torproject.org/tpo/core/tor/-/issues/40908
the tor_bug_reached metric basically becomes meaningless because it is "normal" to see that counter increase all the time. To work around that issue we filed the following issue which would make it possible to run exits with conflux enabled without rendering the tor_bug_reached metric meaningless:
https://gitlab.torproject.org/tpo/core/tor/-/issues/40930
FYI from the tor log file:
This tor is a relay and ConfluxEnabled is set to 0. We would ask you to please write to us on tor-relay@lists.torproject.org or file a bug explaining why you have disabled this option. Without news from you, we might end up marking your relay as a BadExit.