Based on what do you make that observation? None of the claims made by Philadelphia can be independently verified because the city makes it illegal to disclose any information about the program. If it’s so wonderful, what are they trying to hide?

Link to law

“Notwithstanding any other provision of law, information prepared under this Chapter and information relating to violations under this Chapter which is kept by the City or its authorized employees or agents, including photographs, written records, reports or facsimiles, names, addresses and the number of violations under this Chapter, shall be for the exclusive use of the City, its employees, its authorized agents and law enforcement officials for the purpose of discharging their duties under this Chapter. The information shall not be deemed a public record under the act of June 21, 1957 (P.L. 390, No. 212), as amended, known as the Right-to-Know Law. The information shall not be discoverable by court order or otherwise, nor shall it be offered in evidence in any action or proceeding which is not directly related to a violation of this Chapter.”

I will add that Washington, DC used to claim massive accident reductions. Until the Washington Post proved those claims were completely bogus.