It beats no teching, pretty sure, but it might lose to rolls and late teching. I thought of that too though, how it gives the opponent some breathing room.
But if it's that hard to escape, it doesn't matter that much if they see it coming.
Although it's true you need 4 stars to do mixup off it. 1 for Gurren, 3 for Tsubaki / Renka Kishuu.