It's essentially a heat race to decide pole and get some interim points. So if you're going all strict about it, then it's a pole position only.
If we go back to the very first Grand Prix, the race was held over 2 days, and the cars started the second day in order of times from the first. So if you finished the first day 10 minutes behind the leader, you started the second day 10 minutes after he started.
In a sense this is the same thing, only without the time gap. We do not credit Szisz with 2 wins, only the one.
Also, the 1959 German Grand Prix, held over 2 heats and decided by aggregate times. Tony Brooks crossed the line first at the end of both heats. We credit him with one Grand Prix victory for the weekend, not 1 or 2 non-title wins.
I am more aligned with the 2-day race thinking. Technically racing starts Saturday afternoon with the Sprint Race being the first part of Sunday's Race. As it's additional 100kms of racing distance, it earns some points for what it's worth, in this case 3pts for 1st, 2 for 2nd and 1 for 3rd.
Similar to having a standing start for a red flagged race, Sunday's race continues what started on Saturday in the order of the Sprint Race finish. Just like in the red flagged races, the pole position at this stage is of no statistical significance.
More points are earned on Sunday. Essentially not only has the race format changed, but the race distance has been extended and the points system adjusted accordingly.
From this perspective, pole sitter is the guy who wins qualifying on Friday and therefore like Vettel argues, should rightfully go into the record books.
And because the race format is technically over two days, there should be only one win at the end of the race on Sunday. A new category for Sprint Race winner is unnecessary.