You did not post the YouTube link where YouTubers say that NordVPN can save investors from hackers; you may have taken this out of context. All VPN features can only change their location to avoid being tracked; there are no special features that can make a VPN protect you from hackers if one of the apps of the hackers gets into your system.
But I will consider using a VPN to protect my identity and to strengthen my privacy so hackers cannot trace my location. If what you're saying is true, then that YouTuber channel should be reported for misleading information.