At no point does that post by Rossman state "The batteries in this shipment were counterfeit". If the batteries were built to Apple's specifications explicitly for the purpose of going into an Apple device and were not used, does that make them counterfeit?
If he is getting the same kind of of surplus parts we get here in Europe (everything comes from Shenzhen anyway...) then there is functionally no difference between them and the parts installed in an Apple device, because that is the specification they were built to/what their intended use at production was. I doubt an Apple engineer could reliably distinguish between parts used in a machine then recovered and the kind of surplus you get from decent resellers in China, they are for all intents and purposes the exact same part.
If he is getting the same kind of of surplus parts we get here in Europe (everything comes from Shenzhen anyway...) then there is functionally no difference between them and the parts installed in an Apple device, because that is the specification they were built to/what their intended use at production was. I doubt an Apple engineer could reliably distinguish between parts used in a machine then recovered and the kind of surplus you get from decent resellers in China, they are for all intents and purposes the exact same part.