You assume all homeowners are happy with the situation. That is definitely not the case. Many looking to upsize or thinking about housing for their kids are not pleased with the rising prices. And this crowd is growing too.
That doesn't really capture it though. Anyone who lives in a home which is occupied by the owner counts in this figure. So if someone in their 20s is unable to afford to live on their own and has to live with their parents, they will count towards this homeowner statistic.