One has to put these recent fast times into some sort of historical perspective.
For a start, the current crop of half milers have no excuse for poor splits, when they have programmed light pacing in most races on the circuit, which is much more condusive for running even/optimal splits.
On top of this, the likes of Brazier, Hoppel, Arop, Wanyonyi, etc, have been using 'super shoes', enabling greater energy return (which is part of the reason why there have been so many relatively fast last 200m, historically the slowest part of the race), certainly since Brazier's breakthrough season of 2019, and possibly as far back as 2016 (where I believe they were first tested in Rio by some elites).
Then there are the 'fast tracks'. There are definitely some tracks that are faster than others, including several indoor ones. The commentators often refer to it and the athletes know too; actively seeking their record attempts at those that give greater energy return.
We also have Mondo claiming on a regular basis that the latest championship track is their 'fastest one ever.' This claim was made in 2019, 2020 (Olympics in Tokyo - 1% faster than previous - backed up by 400H WRs) and the 2021 Worlds in Eugene.
If you put these guys in 90's technology, you can add about a second to their times.
In my eyes Gray is still the fastest American 2 lap runner.