The valve reliefs go below and outside of the circle's diameter.
I have CC'd a piston having a 0.080" deep dish, but w/o the deeper valve reliefs like that piston seems to have (if the Summit photo is actually representative of the piston and not a stock photo). The volume for that Chevrolet production piston is 11cc.
The piston in question will have a slightly larger volume than the GM piston, if the reliefs are actually as depicted in the Summit photo. That's why I added "11-12cc
" to my answer. In actuality the volume is probably a bit more than 12cc.
More: Dish volume