As far as standing down goes, neither the OC nor the committee can remove an owner or a committee member from exercising their rights to attend meetings and vote.
True for general meetings, not so for committee meetings. For the sake of clarity, in NSW members can be removed from the committee at a general meeting under Section 35 (1)(e). It used to require a special resolution, now it only needs a simple majority and the sacked owner may not rejoin the committee for another year.
35 Vacation of office of elected member of strata committee
(1) An elected member of a strata committee vacates office as a member—
(e) if the owners corporation, by resolution at a general meeting, determines that the person’s office as a member is vacated,