What does that mean in practice? Her profile doesn't say anything about being an information being.
And why would being an information being would allow her to move in a place of sealed concepts? These two things don't seem related at all
It's not a place of sealed concepts in my understanding. It's a place of a spatial lock put into place using concept manipulation. That's an important difference.
Let me give an example from Eshita's own verse.
Brunhild Schild has the ability to add the concept of "Writing possesses power" to reality. Doing so makes it such that what she writes has a corresponding effect. E.g. she could write "explode" on a paper and it would explode. Let's say, for the sake of comparision, that Brunhild would make a ring of paper and write "Spatial Lock" on it. Then the concept that gives her writing power would create a spatial lock.
I would argue that Eshita could walk straight through that. She may not resist concept manip, so she can't prevent the spatial lock being created, but she resists the effect of space on her. No part of the conceptual power forced the spatial lock to be able to restrain her, it just is responsible for the spatial lock fundamentally existing.
For contrast, there is for example the Stillness Concept from
Noah. That is used so that the concept of Stillness is applied to the target and by that it can't move anymore. Here, Eshita is directly conceptually manipulated and the concept directly says that she may not move. That she would be completely unable to do anything against.
As I like to say it when I try to convince people to let OnC Characters into tourneys: Not every application of concept manip is necessarily dead end OP. It depends on implementation.
She is an information entity given physical form. Gods can also exist as incorporeal virtual manifestations aka Ether beings (as mentioned in the immortality explanation on her page) so their minds aren't really bound to space. The importance of that is that she can still think in a spatial lock, where other entities might not.
If she can think she can use her own abilities to erase the space into Ether. Since we don't equalize Dao and Ether, I assume Ji can do as little against an Ether technique as Eshita can do against concepts. He doesn't have anything information related, after all.