You are confusing roles here,
The chair of the meeting conducts the running of the meeting, ensuring everyone is able to debate any motion.
You could just as easily have the real chairman, or any other agreed party to be chairman.
I doubt whether the strata manager can speak for the motion. Firstly they are not an owner, so do not have any voting or speaking rights. Secondly, it’s clearly a conflict of interests and they should excuse themselves from the debate.
However it seems the committee is happy with this strata manager ( for whatever reason) . Sometime,just because you don’t like something, does not make it wrong.
If you want things changed, get elected to the committee. That’s where the power is and decisions are made.
As you probably know, few owners turn up to general meetings, and those that do just go with the flow.