(Related - Sultan of Brunei and His 5,000 Car Collection)
According to The Drive, these cars were seized due to an investigation against him, led by the Swiss authorities. Le Dauphine also reports that he will be going on trial next year in Paris over "ill-gotten gains." Apparently, the cars were seized at the Geneva Airport leading many to believe he was trying to smuggle them out of the country before they could be seized.
https://www.instagram.com/p/BMT14p4DH4K
Instagram user @swisssupercars happened to capture some of the cars being seized, while other cars were captured in photos behind a chainlink fence.
https://twitter.com/GVA_Watcher/status/794123630108143616