I would unpot the plant and check out is root system. I think our problem is the root system of the plants are decayed.
The second plant looks to me like it is in a decayed mix that is too compact, and it was overwatered. With this type of mix air cannot get to their roots. I know paphs are labelled as terrestrials which can be misleading, but many of them are not. their roots defininetely need air, even those that do grow on the ground stay in leaf litter.
Also yes you can cut off all the dead growth.
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Fren
Orchidacea are the largest and most diverse of the Angiospermae, and includes 800 genera and 30 000 species
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