Pot-bound Oncs can need a lot of water, much more than orchids like Cattleyas. I could easily see watering one with roots like this and in bloom every day. The roots are mostly healthy, so the pleating was probably from not watering enough. When not in flower nor pushing flowers they need less water, but still should not dry completely. In warm weather I need to stand mature potted plants in dishes of water. I now keep them in semihydroponics.
__________________ May the bridges I've burned light my way.