The name Rivers Edge appears across the eastern United States. River's Edge in New York City is a life plan community for adults 62 and older; Rivers Edge Plantation in Shallotte, North Carolina, is a gated golf and beach community on the Shallotte River; and various golf courses and small businesses use the name as well. None of these are shown to be related to the Matamoras development.
For anyone researching the Pennsylvania community specifically, adding 'Matamoras' or 'Poconos' to a search filters out most of the noise. The clearest public marker of the Matamoras development's identity remains the Rivers Edge Homeowners page, which exists for its residents.