I confirm that the IronAxe system more accurately reflects the skill of the players. But it can only be applied to one tournament, and IronAxe himself said so. In the case of such application, we get the case mentioned above by you and me, where, in principle, incomparable things are compared.
If you are concerned that a larger gap in the rating can be obtained in short tournaments (the winner's result is less than 10 days) than in long tournaments (the winner's result is more than 10 days), then just take a look at the results of past tournaments. In short tournaments, the density of results is much higher => and it is more difficult to get a gap in the rating there. An interesting result was obtained in the 4th stage of the ВК tournament, where the winner completed it in 3 days, and the second-place finisher in 11 days - however, this is simply explained by the fact that there are no good players in the top 4 on our portal (except for the player who completed it in 3 days).
Все люди - братья, но в каждом из нас спит волк.