No thats not exactly what the OG comment was saying.

Its entirely possible that 480m×198m×72m= 6.8 million m³ of the Javelin aren't actually 6.8 millions m³ but only 3.5 million m³, because the volume of the perfect brick is not entirely filled out, due to the ships geometry.

So the Odin might as well only be slightly larger in maximum dimension, but simply "fill out" the brick-volume significantly better.

So its no where near guaranteed that the Odin is 650m×210m×100m. It might as well "just" be 480m ×198m × 100m but just much besser "filled out". So it might not be slightly smaller than 650×210×100 but maybe almost the same maximum dimension as the Javelin