Yes there is room to go with Hoppel, no doubt about that.
And I do still believe that a career pinnacle performance in the 800m comes from positive splits but not to the degree or fashion we have seen from guys in the past like Rudisha/Kipketer. My personal belief is that a pos. split in the 0.5-1.0 second range is the sweet spot but it's all about how you execute each phase of the race vs just a pure split time. You can run 50.0 seconds many ways - how you do it in the 800m is what matters.
One thing we have seen happen with almost unwavering consistency when 800m races are planned to go out in under 50 seconds, is the first 100 and 200 meters are run way over-speed. I think there is some psychology to running 49.X with pacers and racers that see these absurd opening quarters. Look at both Kipketer and Rudisha in their WR/PR's. Kipketer opens up that wild Zurich race in 23.1 then following that with 25.2 to split 48.3 and Rudisha 23.4 en route to 49.28 (25.9). Even a typical DL race planned to go out in under 50 suffers from this - take Eugene last year when Wanyoni ran 1.42. He ran 23.9, 25.6 to hit 49.5. It is crazy how when you break down each 100m split, the biggest split differential happens from the first to the second 100m and it's a massive difference when you compare to the rest of the race.
Historically it is really hard to run under 26.0 seconds for the final 200m once you start running in 1.41's no matter how you run it. Like we have seen guys run in the 1.42's with big finishes (Brazier, Hoppel, Borzakovskiy) but this doesn't really happen below that threshold. The only guy in history I have seen do it is Kipketer who ran 25.4 in the final 200m at the 1997 DN Galan in Stockholm when he tied Coes WR of 1.41.73 to the 100th.
You are right, the way Hoppel finishes this race points to a lot more and I don't believe the WR is in play but the AR definitely is. Look at the current AR holder Brazier. He had that epic run in Zurich where he first broke 1.43 and it's hard to get splits off the video because he is so far behind hilarious doper/refrigerator carrier Amos in it but he runs 1.42.70 off a 25.1 first 200 and a 50.7 first lap, closing in 12.8 (so we can guess the final 200 was high 25 ish). When he broke the AR with 1.42.34 he was 23.6 and 49.1 at the bell and believe this or not, closed in 14.0 seconds (he was 1.15.1 at 600 though). Somewhere in the middle of that is a 50.5, 51.0 run for 1.41.5. I think Hoppel could do the same - after seeing the strength he had in that final 80m I see no reason why not. If Hoppel can get a race where he can run a smart 50.5 opening lap, not being forced to sprint for position to the 200m point, he can do that. But this is always the tough part in a top quality 800 race because you have to weigh up your pace judgement vs the bodies you have to out manoeuvre in the final 300. It's stating the obvious but it's why hardly any 800m runner will ever reach their true ceiling of performance unless it's done in a time-trial environment, but then of course the performance technically doesn't count. But yes, Hoppel can smash the AR from a pure physical potential standpoint.