There might be a few good roots in there. They don't look like they are rotted which is good. I would cut off any root that is dead. A dead root will feel empty and papery. Cut off any root that looks black and rotten.

Then I would put the entire plant in a plastic bag sitting it on a small ball of damp moss. Seal the bag and leave it for a few weeks. This will help prevent the plant from drying out until it starts to grow new roots.

When I have done this I open the bag now and then to let in some fresh air. When you see roots beginning to form you can take it out of the bag and put it in a pot on top of damp moss. I had one just like this about 3 months ago. It is doing very well, never lost a leaf and is growing new roots. I did not use rooting hormone but probably would if I had some.

I think it is easier to save a phal that has lost it roots than one that has lost its leaves.