Thanks, I can see in that document it's referring both to "Chatswood North" as the name of a "Local Area Traffic Management (LATM)" which I probably wouldn't think as warranting a place=neighbourhood but also as the "Chatswood North precinct" which probably does warrant place=neighbourhood.

place=neighbourhood has varied use in Sydney ranging from GNB assigned urban/rural place names that don't form formal suburb/localities, usually as a area/region of a suburb, but also for named residential estates.

I think then it's okay to map "Chatswood North" as a neighbourhood here, though improved tagging practices and tags to better categorise "neighbourhoods" would be good for OSM.