LoL, don't get all defensive - I'm not trying to twist your undies.
The definitions of OES, OEM and Aftermarket parts are what they are for a reason, and are based on the definitions used by the parts industy. It actually makes more sense than you think. That's why I said read that article again on their examples because I don't think you see the industry's logic. The definitions are actually pretty specific and precise.
If you don't agree and want to make up your own "definitions" then go for it, but you're not speaking technically correct about it. You can't have one same exact part be both OEM and Aftermarket, even if they are the same exact part but with only a diffefent name on them. How would you distinguish between them otherwise? If one filter was branded "Motorcraft" and one branded "Purolator" (both identical otherwise), which one is associated with Ford and consideted the OEM filter? It certainly isn't the one branded "Purolator". You don't go to a Ford dealership and ask for a Ford OEM oil filter and the parts guy brings out a filter branded as "Purolator". By your logic, they could both be sold an OEM or an Aftermarket part, but in reality they can't, even though they are identical inside and only the brand name is different. That's how the parts industry operates.