My understanding is that NBN only cables to an access point at or near the individualunits
For FTTP and HFC connections that is incorrect, NBN will install a connection box inside the premises.
The real issue here is how NBN is treating unit owners worse than house owners.
With NBN having essentially completed its rollout they are now focussing on replacing the remaining copper, so moving people from FTTN to FTTP.
When a house owner wants to move to a higher speed plan not supported by their FTTN connection, NBN will upgrade them to FTTP for no cost (in most cases).
For unit owners, NBN will only upgrade entire buildings, which is fair enough, but at a cost of $275 per unit.
https://www.nbnco.com.au/residential/upgrades/more-fibre-for-buildings
So buildings need to decide as a whole whether to pay and upgrade or not, that’s strata.