This is a very unfortunate situation for the homeowner.
First of all the homeowner signed for the covenants and must have known about the Architectural Review Board. The landscaping change they made is very radical, so surely the homeowners must have talked to other people about the change - neighbors or vendors or The Villages.
That said the vendor has served The Villages since 1999 so likely knows the covenant restrictions and any morally responsible company would tell the homeowner that the change would not be allowed.
I wonder if this homeowner has met with the vendor and attempted to get some relief (refund) from him?
A situation like this could do this vendor a great deal of harm if he does nothing to help. His website shows a BBB logo so the homeowner could file a complaint there, as well as with The Villages. Then there is always Small Claims Court if the claim amount fits the Sumter County parameters.
Details of all Florida Business entities, Corporations, LLC's etc can be looked up at
www.sunbiz.org.
This search will show the principals and registered agent's names and addresses.