CTTT, now NCAT, say if you have a copy of the strata roll then there is no issue with using it for contacting other owners.
Hard to imagine it would be a problem to contact other owners regardless of if one had a copy of the strata roll..
“Secondly, even if an address for service of notice is “information … about an individual”, part of the primary purpose of the collection of lot owners’ addresses and their inclusion on the strata roll is so they can be contacted by other lot owners and the Executive Committee of the Owners Corporation. … ”
Legge v Network Strata Services Pty Ltd (Strata and Community Schemes) [2013] NSWCTTT 45 (8 January 2013)