Black dots shouldn’t deduct anything. I’ve personally graded one with the EXACT same dot in the exact same spot and got an 8-- card was flawless other than a couple print lines. Sold it and the guy got it regraded as a 9 first try. Prior to submitting, I made pretty much the same thread:
www.elitefourum.com/t/quick-ink-dot-question-grading-a-wotc-holo/25618/1
It seems that the dot is fairly common and has not stopped em’ from getting 9’s.