VPN does reduce my ping by 50!

It reduces latency by 50 in-game... ( It's also stable, tested for two weeks ) so why people say don't play a game with VPN on? Do I continue to use VPN while playing? or that 50 ping reduction is just a script-lie or stuff I dunno ( I used speedtest.net and it shows that 50 ping diff as well ) Does a VPN hurt my gameplay despite reducing ping and making the connection more stable? My ping : without VPN : 64-67 with VPN : 13-18
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