Use the highest GPA that’s on the transcript. Always. No rounding. The AO will have the grading methodology on the school profile. They are going to look closely at the transcript no matter what and re-calculate as they will. Some schools use the course and grades from common app, some SRAR, some something else.
I don’t think it much matters if he divulges his race or not…they probably have enough info based on his name, address, HS, demographic info he may have filled out on test registration and/or admission session registration to give them a strong indication of his race.
Good luck.