Thanks for the video and measurements...that helps. A bit smaller than I expected, and I'm not really sure where the space is going. My wife's 2021 CX-5 has an overall length of 179.1" vs 188" for the Ocean, 72.5" width vs 78.5" for the Ocean, and a 66.2" height vs 64.2" for the Ocean. Granted, the Ocean height is a bit lower, but it's also 9" longer and 6" wider.
The Mazda has a cargo capacity of 30.9 cu ft vs roughly 21.7 cu ft for the Ocean (before taking into account angling in of windows/greenhouse/etc). Maybe the Ocean will have huge legroom, but from the video above, the guy sitting in the back seat looked about like what you'd expect in a compact SUV.
I have a full-size pickup for hauling duties so not a huge deal, but genuinely curious where the capacity went, since a lot of the things that might usually eat into interior space in a gas car don't exist.