Marketing repair parts as OEM that are not OEM is fraud. Certain companies have successfully taken legal action against repair shops that claim they use OEM parts.
Understanding what "OEM" means is critical when sourcing repair parts.
Example: Apple Inc. doesn't manufacture their own devices. Apple devices are built and assembled overseas. Apple Inc., then, is the OEM Reseller and the primary manufacturers are the OEMs.
The disclaimer on the iPad states that Apple is the designer and distributor. The OEMs are anonymous.