Those cuts are smaller then the ones on my rear tire, which has 3500 miles on it. I inspect it weekly for signs that the cuts are getting worse. You can't be too careful on a two wheel vehicle; you can't afford to have a catastrophic tire failure. I would be more worried about damage on the side walls which are very thin. In my closet is a pair of GP4000s which I got on sale a couple of years ago.

YMMV (no pun intended)