Nope, if you were to pull the root ball you would see your completely rotted. I bet that it is all mush! Smell like a fish pond? If you really want to save it you can but you need a few things. I usually don't give advice, besides you didn't ask. buuut
Your going to have to pull it, the substrate is saturated in pythium spores. The concentrations of bleach and/or h2o2 needed would be toxic.
A very strong concentration of h2o2 to soak the roots that remain after you clean the worst of the rot.
Soak it for a couple hours swirling it around to loose the crud as the h2o2 does it's thing.
Your going back into soil and watering with amended filtered clean water with a strong mico like aquashield at the strongest recommended concentration and a drop of vitamin b spectrum like thrive alive or super thrive.
Otherwise you need to completely sterilize your system and substrate including heat and bleach treatment. However I have found that drying out the affected substrate, heating it, and sterilizing it a second time is often necessary to completely remove the chance of reinfection. Already it's having the stress of a lifetime and getting it into active soil can have your stress impact minimized.
Man, that sucks. That shit can linger and if you let it go too much longer you could loose them all together. One thing I see is that most people don't aerate their reservoir enough, 40 liters per / minute / gallon is recommended for aerobic conditions. Of course keeping temps in there 68 or lower is necessary especially if the airflow is lower.
Personally, hydro is a no - no in the summer months unless your ultimately equipped.
Your not lying, it is so much work to clean up your whole system like that. Also if you leave even a couple spores it will all be back again.
anywho, my 2 cents