If they really wanted to change regulations they’d push changing zoning regulations in cities to allow building anything other than detached single family housing. That would be totally reasonable and help alongside tax incentives. But I have a feeling that’s not what’s meant by changing regulations…
Before you can start to change public perception it needs to be legal to build densely. Parking minimums and a variety of other commercial building code regulations make this much more expensive in the US, all while the people nearby in single family homes fight any new builds due to their poor perception of condos and apartments. Just removing the stigma is only one part of the equation.