Is Samsung Pay points earned for tapping masters credit card for SimplyGo?

Yes but its not earned per trip. Its earned once every few days (only the first trip)

For example:
The first trip i tapped on Wednesday i get 10-30 points. (Depending on your tier)
Then afterwards for the rest of the trips on Wednesday i dont get any points.
Thursday I tapped also no points.
But then after a few days later, i get the points again for the first tap.