Can't tell if my phal can be saved

[NYCorchidman]

I am a little confused because you mentioned how your phal regularly grew leaves and flowered for years, then two years ago, it stopped growing and you changed the media of a proper kind.

If your plant grew and flowered fine in not so ideal potting media, I wonder why it would suddenly stop growing. You also said it hated the soil type media. what do you mean by your plant hated it when you also mentioned it grew and flowered???

The lost leaves, do you recall what they looked like?
slowly yellowed and fell off (which is natural) or something else happened?
Your phals roots rotted apparently in such a dense old media.

The good news is that there is still a chance since it has roots, not many but living roots.
As someone mentioned above, high humidity is very important for sick orchid. I would recommend placing the plant with its pot inside some sort of glass container like an aquarium with top open for air flow. place wet moss around the pot on the bottom of the container to raise humidity. do not keep the potting media too wet as this is not good. just moist enough. and just mist every so often. when the media seem somewhat dry, then take the pot out and water well and put it back.
Avoid direct sun, but do place the plant in a bright and warm place.
then just keep your fingers crossed and wait for new roots and leaves to grow.