They did not. They allowed duplexes and townhouses in some places that were limited to single houses (https://www.newsobserver.com/news/local/counties/wake-county...).

This change ultimately allowed something like 10% more units in the city on a 100 year horizon.

This is what I'm calling out - these changes sound big but they are nearly meaningless. Cities need periods of explosive growth to remain affordable (see Jane Jacobs, 1961 and 1970).