I would assume that if these leaves aren't suffering from some type of bacterial or fungal infection, then leaving them alone would be the best plan of action. If I remember correctly, your phal was suffering from sunburn, right? I would trust the plant to make it's own decisions about when to kill off a leaf. Even with the dead spots, I would guess there is still viable chlorophyll doing its thing and by cutting the leaf, you run the risk of infection from the wounds. I'd definitely put cinnamon on those cuts to make sure they don't get icky stuff in them and endanger the plant.
I could be way off base here as I'm relatively new to orchids myself, but that's my two cents. Just going by some basic principles, but I'd trust the opinions of the experts around here first! Good luck with your phal! WIth proper TLC, it'll make a full recovery in the years to come. Just don't give up hope