If a potential purchaser either directly or through a solicitor requested the contact details of all owners from the SM then this could be odd depending on the circumstances.
If the lot seller confirms that this is a bonafide potential purchaser then this would be ok. Here I’m assuming that only strata roll and hence the contact details on the strata roll are being requested and not other contact details. The strata roll contains the nominated contact details which may not be the regular or personal contact details of an owner.
But if there is no direct confirmation or otherwise from the seller then this should be treated cautiously. We’re all being advised to not hand over personal information willynilly to protect us from scammers. Also that “purchaser” could really be someone trying to circumvent a restraining to locate an ex who happens to lives in the same scheme.
The better way would have been for the seller to have the strata roll on hand to make available as required either directly or through their realestate agent.
Irrespective of the above the SM has erred in accepting the directions of a solicitor representing a non-owner (whether a bonafide potential purchasor or not) to cancel a strata meeting.