First off...
The advice you got about the plants suffering from dehydration is only part of the story! It's actually a bit more complicated than just "it's dehydrated".
The part(s) that got neglected is
"Why is the plant dehydrated?", or "What is causing the dehydration to occur?"
The quick and easy answer of "the plant is dehydrated" assumes a lot of things! One of the simplest misunderstandings is that the answer is to simply water more, which may not actually solve the problem, but make it worse!!!
So to answer the question of why the plant is dehydrated, we have to look at the possibilities.
And they are:
1. It just plain needs more water. Simple. Done.
or...
2. The roots got severely damaged to the point where the water uptake of the few roots that are still alive and healthy is very limited.
or, worse yet...
3. The plant has no living roots on it whatsoever! Without roots, the plant has severely limited means of obtaining the proper amount of moisture to keep its cells turgid.
When diagnosing problems with orchids, I encourage people to look at
all the possibilities and exploring whether those possibilities are what really is going on. It is not always easy and clear cut.
Do not be deceived by the "obvious". Solutions to problems will not always be "obvious".
Secondly, I think that pot is just way too big for the plant, unless the plant really does have a root system that large.
Another thing...
The pictures are too small. Pertinent details that need to be focused on in the photos cannot be seen. Is it possible to take more photos that make the issues you are talking about clear to the viewers, please?.