I guess they could fake the certification. Here is their site. They seem to explain pretty clearly the process for certification. If they were fake I think it would be pretty big news after all these years.
https://www.maxilite.ch/en/wheels/ABOUT-US/

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT