I manage a HOA with 1900 homes. This would be called a home occupation and the complainant would be told that nothing could be done to stop someone from enjoying their home occupation. What happens when he has to paint his house? The yard furniture? The fence? Sounds like he has an angry neighbor close by to me.
“This would be called a home occupation and...”
Some HOAs don’t allow working out of your home. Others allow it but have restrictions on noise, customer parking, etc.
This article is short on any real information.