Actually, no, Ellimist. There is no evidence he used bombing on Katarr: Visas would have told Meetra if that were the case. And the Jedi Exile never set foot on Katarr. Visas said to her that Katarr was also a void in the Force.
By the time she sets foot on Nathema, she already fixed herself from her Wound in the Force status. So, she was as vulnerable to 'echoes' as any other Force-sensitive.