Isn't that because the buildings are way too far away from the camera when compared to the ice:
(Sukuna and the ice should be around the middle of the crater since
Sukuna was right below where the hollow purple started expanding)
So the buildings are over 500 meters away from where Sukuna and the Ice are, and Kashimo would likely be on the hundred meters away (From the buildings) since he was rushing at Sukuna.
I don't think there's any inconsistency in the framing, its just perspective from how far away they are.
---
I also don't think using the domain as a perspective is right, since, again first off,
Kashimo was 203 meters off-ground yet the ice looks EXTREMELY far away to where he is, the Ice even likely started it's fall from like 500+ meters above ground, this because,
since hollow purple exploded in all directions, and Uraume obviously wouldn't wanna get hit by it. This also matches how far away it was compared to where Kashimo is (I still think we should only use 300 meters, don't get me wrong, just noting it for the next point), yet despite this, the Ice was falling
rapidly as
it goes from that much far away to reaching near Sukuna in just 3 pages.
The reason why that is important is because as the domain page says: "
Despite Hakari trapping Uraume within his domain... the block of ice continued plummeting toward the earth."
So the ice didn't "slow down" or anything, even using 300+ meters and assuming 3 seconds for how long it took to reach near sukuna, it would mean the ice is plummeting
at almost 100m/s. So by the time Hakari's domain is finishing expanding, the ice would have already fallen down alot more meters and isn't in the same perspective as the domain,
the same would apply to the humans when compared to the domain aswell.
Though I will agree Gege really can't decide where the domain even is during the chapters lmao, idt the ice is that small tho, it doesn't even look that small when compared to the 1000+ meters diameter crater aswell so like