There certainly wasn’t a quorum, so essentially there was no meeting. Note that you can’t use proxies for a Committee meeting. The strata manager may claim they held proxies but that doesn’t help.
Any purported resolution at the purported Committee meeting is not valid, so any “election” of office bearers is not valid. That is because there was no quorum.
As Jimmy says, it’s not unusual for office bearer roles to be delegated to the Strata Manager. That might be in the agreement and/or agreed by the owners or the Committee.