Dude, no offense, but you are not demonstrating a broad depth of real estate knowledge here. I explained what the term 'quiet enjoyment' means.
Outside of city, township, or county zoning, or outside of homeowners association contracts he may have signed, he is not in violation of penal or civil law.
Please try to understand that the fence is on the DEVELOPER's property, NOT the homeowners property. There is NO WAY that building a fence ON HIS PROPERTY can affect the homeowners enjoyment of THEIR OWN property.
The lake and strip of land belong to the DEVELOPER, the fence is on the developer's land. The only thing that can be affected by the fence is the homeowners enjoyment of a view/land that the DEVELOPER OWNS.