I found what you're talking about.
If you can make the changes that would be good, especially if you know more about which version of the characters have this power in the first place. Idk much about warhammer lore so Idk which tabs/keys would have Dimensional Manipulation or not, the ones unlocked I can try to make the changes...
vsbattles.com
Yes, expanding the Low-2C structure to 2A is not sufficient for Dimensional Manipulation. However, expanding a Finite-Infinite 3D structure into a Low-2C (4D) structure may qualify for Dimensional Manipulation as stated here.
That tells me absolutely nothing on it being dimensional planes being warped.
vsbattles.com
If I had to explain my argument:
We saw that Rimuru's Unique Skill, Predator, only has Finite-Infinite 3D absorption. Therefore, we have to assume that the Predator's stomach is Finite-Infinite 3D.
We later saw Rimuru's Unique Skill Predator evolve into the Ultimate Skill Gluttonous King Beelzebub. Beelzebub has 4D Absorption, and Beelzebub's Evolved Stomach was large enough to contain a 4D structure (Universal Space-time Continuum).
And finally, Void God Azathoth, which is the combination of Rimuru's Four Ultimate Skills, has at least equal absorption (4D) as Beelzebub. When Rimuru obtained the Void God Azathoth, Ciel expanded Beelzebub's stomach (Low-2C) into the Void God Azathoth's Imaginary Space (2A).
So Void God Azathoth's Imaginary Space (2A) > Gluttonous King Beelzebub Stomach (Low-2C) > Predator's Stomach (Finite-Infinite 3D)
Therefore, Rimuru must have Dimensional Manipulation due to evolved Predator's finite-infinite 3D stomach into Beelzebub's 4D (Low-2C) stomach. I know it's a bit vague but I think, it should at least probably get a rating.