Well if that true then everyone has much bigger problem. Because then any VPN services becomes useless. It would be nice to see if Fox-IT could do similar tests

Well if that true then everyone has much bigger problem. Because then any VPN services becomes useless. It would be nice to see if Fox-IT could do similar tests by using VPN/TOR. But I think that VyperVPN still is the most secure VPN if it really does have this; "Chameleon scrambles OpenVPN packet metadata to ensure it’s not recognizable via deep packet inspection (DPI)"