As written, the tetori's Inescapable Grasp duplicates the effect of a 'dimensional anchor' spell starting at 13th level AND that it replaces Abundant Step--which a monk gains at 12th level.
Is the "13th level" in the description a typo, or intentional?
I wouldn't be surprised if it was a typo, but it wouldn't be the first time that an ability has replaced something at a different level than the original ability was gained.