I plugged these numbers in to my calc - 400 yards, 0 elevation and got 1.4 MRAD (7prc). Then again at 400 yards, 10000 elevation and got 1.5 MRAD. So, that .1 MRAD difference between 0 and 10000 at 400 yards. It would seem that the bullet isn’t in the air enough for the elevation to have a bigger impact. I am not a wizard at math or with Balistics Calcs, so check my math. I used this for reference:
The Effects Of Temperature and Altitude In Long Range Shooting.
I will admit up front I don’t have years of experience in the rifle shooting game. I’ve shot pistol for decades, shotgun for 10 years, but really only got serious about rifle in the last 3-4 years. So, it could be my mistake, but I had the same thought as you.
I used the online Hornady ballistic calculator for a 180 gr .308 cal Barnes TTSX bullet at 3100 fps and keeping all other variables constant looked at sea level, 5,000 ft, and 10,000 ft. out to 400 yards. If I did it right, my results agree with yours, showing a measurable, but not significant change. In my example it was a difference of 1.9 inches in drop (.5 MOA at 400) going from 0 to 10,000 ft. I have no idea how well the scope’s software corrects for the altitude change, but it seems at reasonable hunting range, it might not be a significant factor.
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