Rigid body FSI

Hello community! I'm currently following the tutorial of "Modeling a Ball Check Valve using Mesh Deformation and the CFX Rigid Body Solver". At the begining i saw that it is a two way fsi case. It makes me confuse that if that is a rigid body which there will be no deformation calculated and makes it a 1 way fsi. How could it be a 2 way fsi without the structure slover? If it is, how does flow impacted by the structure? Thank you!

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