Is it because Yhwach outright blasts Ichigo away with the same telekinesis he used to lift the Wandenreich(?)?
And he was pretty much fine right after?
It's more because of the fact that Yhwach's TK is a literal part of his powers as a QUINCY!
Meaning he would be hitting everyone with that level of power ALL THE FUCKING TIME, especially as the Soul King when we see him literally be able to stop the Soul Reapers from using Reiatsu to just fly to his Palace and is forced to walk and run instead.