Beginner's advice on "sphag-in-bag" technique for Phals

[nature]

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I am the new owner of 2 ailing Phals (pix at bottom). With no experience but reading and researching to go on, I have endeavored to save them. First, when I adopted these two plants Phal #1 was in a terra cotta pot, had two nice green leaves (with some browning on the edges), and two flowers. Phal #2 had no blooms, and was in a frosted glass container with no drainage holes! This one I could see condensation collecting on the inside/bottom. Both of these plants had been in a large, bright room with little to no direct sunlight, and were not being watered. Neither had any green nodes, they were brown and dry.

I was very concerned about Phal #2, so I started on this one first. After reading that bark is one of the most popular mediums to put orchids in I got some and a terra cotta pot approximately one inch larger than the frosted glass container that it had been in. I un-potted it and snipped the rotten roots, this was not a quick or easy feat, and I am not sure that I got everything. I then covered the bottom of the pot with shards of terra cotta and put some bark in, then the phal with the hurt roots, then more bark (which I had soaked overnight). I put it on a rack that would allow all the air circulation and drainage that it needed. I also put some water in it which just ran out the bottom. I left this here for about 2 days, misting it a little bit and watching one leaf slowly yellow.

A few days later I un-potted it again , clipped even more rot from the bottom, rinsed it and gently cleansed the crown with a vegetable brush, disinfected the roots and crown with baking soda and hydrogen peroxide before inserting it into a gallon sized ziplock bag with sphagnum moss. I did the same with Phal #1 after realizing that it too had root rot.

I placed both bagged plants on the floor in a bright room, but in the partial shade of 2 large plants. They receive no direct sunlight. The temperature is probably hot, being that this is New York in July, and there is no air conditioning.

I feel horrible that this is so long, but here are my questions!

Is this correct way to do the infamous "Sphag-in-bag" technique, and was this an appropriate reaction to the root rot? (see pics)

What should I watch for?

Wouldn't the roots suffer more from being contained in this way?

Lastly, how do I know if I have removed all the rot when clipping the roots?

Thank you so much! Any and all advice is very much appreciated. It is so nice to be a member of orchid board!

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