I actually wanted to comment on this again after my last comment, but forgot to.
I think 20m is still way too small personally.
- First off, Celestials Comic Canon height is 600m.
- Eson's legs in this scene go behind a small hill, which doesn't even come close to his knees.
- The absolute bare minimum size I could find for a "Hill" of this size (Not even assuming it's a Mountain), is around 30m.
With this, I personally believe it's more than viable to assume that Eson should be comparable in size to his Canon self,