I downloaded the image (what an unbelievably shitty way to host a pic), and he's pulling +1 g at 11 deg alpha, about 650 kIAS, in level flight according to the ADI but 1000 ft/min climb according to the VSI.
Testing it myself, it does seem weird. No matter how level I fly, I can't get below 10 deg AoA. Is that how the F-15 flies?
EDIT: The AoA instrument is in units, not degrees. Also, I found that apparently 12 units of alpha is fine for cruising.
Unless I'm misunderstanding the point of the OP, (which would be forgiveable based on its content), there is no issue.