In Kamui dimensions it is a lot shorter
(Hence why it is called a s/t technique, a minute in kamui world is less than a nano second in the real world).
So his inangiblebody that is moving will pass through the shield, because it is not existing in the same world as yata mirror.
So when he decides to finally exist, he will be standing side by side with Itachi.
He can just warp away his tools as a whole, did you take that into consideration?
That he can make yata mirror exist in a completely different world?
Even from a distance too:
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Just like he warped away kakashi's kamui.