The situation described is one of the holes in the legislation.
Whilst the OC can obtain the title documents to a lot (at a small cost), the legislation prescribes the method of entering such information on the strata roll. It requires a notice usually from the purchasers solicitor. Remember that the information on the strata roll contains not only the owners name, but the address for serving notices. The address may not always be the same as the lot address.
By second guessing this information the OC may expose themselves to the risk thst the true owner argues that notices were not served on the correct address.
Ive been in this situation of not knowing the new owners details. It usually resolves itself when the old owner continues to receive levy notices. The old owner is on the hook for these charges until the strata roll is updated.
it’s surprising how quickly the old owner gets the new owner to get the details changed.