Interesting data - I am not aware of any publicly available source that estimates car ownership at that level of geography. Would be cool to see this data more accessible community-by-community.
The other part of this story is amount of off-street parking in this area - it's typically invisible as the discouse immediately goes to an obsession with onstreet congestion and "never being able to find parking" within a block of a popular destination rather than this area wide view. For example, despite only having a demand of 1 or fewer cars for 59% of households, most households have access to at least 1 or 2 off-street parking stalls. In effect we over-supplied off-street parking in most of these areas, while also undercharged and oversupplied on-street parking everywhere.
Data like this is why developers seem to have no problem selling townhomes with one stall and secondary suites with zero. The demand for parking is far below supply in almost everywhere in Calgary except a few clusters of higher activity.