After looking into this myself, I was unable to find any controls to allow you to hide only your PGC Points reward from profile statistics. There are modules under the settings of the Profile Stats where you can hide specific statistics but those do not include the points.
The only way that I know to hide them would be to use this link https://project-gc.com/Profile/ProfileStats#hidemystats and place a check mark next to
Hide my profile stats from others Check this to hide your stats
Unfortunately, the trade off is that everything is hidden and I realize that is not what you want based on your question.