This all depends on how the deep fake thing is presented, which we don't know. If it is presented as the HG's are supposed to think Angela is the HoH and is the one who made the noms (which would be a true deep fake) then yes, Quinn would get to vote. This would be needed to keep up the illusion of just the one HoH. If he couldn't vote, it would be too easy for someone to catch on when Julie read the vote results that there's one missing. I think I saw somewhere in a convo that Angela would be the tiebreaker vote as the current HoH. There's way too many moving part sand they did a piss poor job of explaining all the details. I get that there is no way they could explain them all on the show, but they should have an FAQ on the website for all these things. Of course, if they did that, then they wouldn't be able to just decide these things for whatever suits their agenda