I did not want to bring this up myself since with the whole Naruto thing it may look like I am just looking for a retaliation downgrade or whatever but I have mentioned this to you like a month ago and since that is what is being discussed now, I guess it is a good opportunity, these are the issues I have with it:
1. Apparently space does exist in SS.
2. They calced the distance from ground to SS as hundreds of thousands of km
logically impossible, since thet would mean that they are in space
yet we see that they are not.
3. The 1000ri argument, according to VIZ translation it is 300 miles in modern terms
And when Ichibei sends yhwach supposedly 1000 ri, we can still clearly see the platform they started on, which is not very big.
The calc that it used to get the distance between Seireitei and SK assumes that Ichibei sent Yhwach 1000ri downwards.
Firstly this is wrong because again it is 300 miles not 3000 like they use it.
Secondly, it is likely that the barriers got destroyed as Yhwach came up pretty violently, so he wont hit any on the way down(new one I just came up with).
Thirdly, Yhwach most likely shot himself back upwards with his arrow before he reached the full 1000 ri, it is the most logical thing and makes the most sense in context.
4. It apparently takes a week for a normal Shinigami to go down spiral stares to Seireitei although it does specify using Shunpo, this clashes with size of Seireitei being used considering apparently it take 10 days for an unknown route to be used to reach another gate in Seireitei that was further away from their position., since it would mean that SK palace is barely above the clouds, or Seireitei is much smaller than we think which more closely lines up with all the sizes we have seen. Though still slightly bigger than said sizes.
Also in the chapter were Yhwach is going to SK palace we see what appears to be the barriers and the distance between them does not look very big to me:https://imgur.com/a/KXwG9LO