Good photos --- good shots! And good description.
Just assuming the orchid was originally in say bark, before you potted into the new mix. Bark is workable. Maybe your new mix is workable too.
You can save these orchids by knowing that the roots are very very dry.
First - unpot the orchid ---- to check ALL the roots that is currently hidden in the media (bark). This is for double-checking the roots underneath.
If those roots appear to be dry too --- and no rotting, not mushy etc, then that is good.
The next step would be to soak the bark in water for some adequate amount of time - in order to get water into the dry bark ------ since very dry bark doesn't absorb water very well (or doesn't absorb at all) - such that if you water dry bark ----- the cliche saying will be that the water will run through all the bark like water off a duck's back. This will leave hardly any water for the orchid to use. And if the situation isn't addressed ----- the orchid can then take a turn and go downhill due to not getting enough water from the bark.
Once the bark is wet enough ----- pot the orchid again, and try to pot it in a way where more of those exposed roots go into the bark media. You don't have to get all those roots into the bark media ----- but put more of them into the media where possible.
Once repotted, hold off on the watering - since the bark will be wet already.
Also ----- what method of watering do you use? Do you put the whole open-air pot into a bucket of water for watering?
Or do you apply water at the surface of the media (and the water then runs through the media)?
Also .... too dry was one thing. But also avoid over-watering --- or over-correction with too much water.
The following details about watering can be useful to you later:
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All the best!!!