100% Root Loss Repotting

[Orchidtinkerer]

Hey sabina,
yes those roots look in terrible shape. You will actually find that if you gently tug on each root they will already be detached from the plant and will pull away with hardly any force, try it, I can see from the picture they are hollow.
I would recommend you do that as the root stubs you have left behind will just rot and cause problems. It is just around the stem the plant is most vunerable and this is where all your dead stubs are clustered.
Since there is some disagreement on whether the roots are alive or not and whether all yutube videos are wrong it would be great if you could confirm or not whether the roots are in fact loose or not when gently pulling on the ends. That is the best way of telling.
What you do with that last pseudobulb is up to you, no harm leaving it for the plant to suck out any last reserves before it will shrivel up and dry by itself.