UAE didn't drill it the whole climb because they were all dropped long before halfway. The only UAE left was Yates who got in Evenepoel's wheel most of the time (he did one turn, just after Kuss was dropped) until he attacked a second time at 3k from the top. So Evenepoel didn't "take some turns", it was Yates who took exactly one turn of 55 seconds in between both his attacks.
You could go to TIZ and put both video's of the final 10k of the Jebel Hafeet stage side by side. You can start at the moment the peloton goes right on the big roundabout at the start of both videos. In the 2022 edition that is 35 seconds into the video. In the 2023 edition it is 2 minutes into the video (1m25s later in the video, in case you need to resync at some point). You will find the pace UAE set was not faster than last year until less than 1km before Yates' attack. So drilling it "the whole climb" can be reduced to drilling it less than 1k. You will also see that last year Yates and Pogacar were paced by their teammates up to ~3km from the finish, able to conserve energy for imminent attacks.
You can't compare conditions 1:1 (heat, wind, race dynamics...) so the fact that Evenepoel did the climb ~40s faster than Pogacar last year should not be seen as an absolute statement. But i do think it's clear that his effort was at the very least in the same ballpark and that there is no reason to downplay the effort as some have done in the race topic and here. Claiming Pogacar or Vingegaard would have dropped everybody here like a bad habit seems mainly based on wishful thinking.
Evenepoel himself has said he appears to be ahead of schedule, and comparing this effort to those of previous editions by other GC riders, i would tend to agree. If he already has this level, and he is targeting the Giro in just over 2 months, there is no reason to assume he will not get there in time.