To be fair, it sounds like the strata manager is merely giving the committee some ammunition to use against owners who want to let their units on Airbnb.
None of this is set in stone but it gives the committee grounds for threatening short-term letting owners.
Whether or not they have a leg to stand on would only be established after it had been run through NCAT and the losing side had appealed.
The committee clearly wants to warn off potential Airbnb hosts. Whether or not it works depends on the hosts.