In those re-tellings we know Kun's spiritual hold on the world was permanently weakened by Horn's destruction of one of the temples. Which only furthers the point that this incarnation of Exar Kun is far less powerful than the Exar Kun we're using in this thread.
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Nah, it states they were all confused and attacking each other randomly or just standing around, they clearly weren't prepared for any major telekinetic wave. It's obviously very impressive, but not compared to legit choking a group of melded Jedi of this caliber. Who were all prepared in an ambush and focused on facing Kun.
That's fine, but given how completely different the circumstances for Kun are here, the argument writes itself.