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It supposedly disables certificate checks system-wide. It may make your PC vulnerable for MitM attacks and who knows what else.
This "ManualCredValidation" is barely documented anywhere on the web.
MS site mentions other values but not this one:
https://learn.microsoft.com/en-us/windows-server/security/tls/tls-registry-settings
I'd say you're probably safe if gaming and browsing websites is all you do. I believe modern browsers implement their own validation mechanisms (OS-independent) but I very well may be wrong on this.