It's amazing the number of WGT players that don't seem to understand the basic math involved in determining their scoring average.
As far as wins in some of the game types that WGT uses to combat players who 'sandbag', WGT does not say how those results are applied to our score average.
How much you are over or under par is not what matters, because par for the various WGT golf courses is not the same.
Your total score is what matters.
1 under par on a par 72 course means your score was a 71.
1 under par on a par 70 course means your score was a 69.
Once we reach the Legend tier our scoring average is determined by our best 500 ranked round scores. Consequently, the rate at which Legend and Tour Legend tier players can lower their scoring average slows way down compared to the lower tiers.