Thank you both for your insights. Yes, by desiccated I mean papery and bone dry. I removed all those roots and repotted in a mix of bark, perlite, charcoal, and some broken up wine corks.
There already was some healthy new root growth beginning, so I made sure the plant is stable in the pot with a rhizome clip and put it in a shadier spot than it had been, under a tree. I've been misting it with some Superthrive but have tried to keep it on the drier side for a bit...
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