I think perhaps the strata manager has been dividing all issues between the “too-hard” and “she’ll be right” baskets, rather than conspiring to do something wrong, for whatever reason.
Or maybe they are trying to do the right thing but really need to go back to strata manager school and could meanwhile do with a gee-up about their lack of effort.
Firstly, the strata manager can issue the NTCs him or herself if they believe a by-law has been breached – they don’t need to wait for a committee decision. Even so, that committee decision could be to send NTCs “to all residents believed to be parking illegally.”
Secondly, the NTCs should be issued to the miscreant – in this case, the tenants – not the landlords.
And finally, as you point out, undr section 258 of the Act, if the name of the tenant hasn’t been registered with the strata manager, that is an offence and is, in fact, one of the few that comes with a fine attached ($550), under law.
Whatever the motivations, your strata manager has allowed the scheme to descend into dissent and chaos. Tell them to get on with doing their job, and stop making excuses, would be my plan.