Yes, all of these techniques apply to phantom limb pain. The mirrors are just another way of tricking the brain into believing things are ok. It can work, but so can these talk methods. Remember that pain is just the brain’s opinion of the state of things. If we can change the brain’s opinion then we can turn off the threat signaling which will stop the pain. The mirrors can teach the brain that it is safe too (through visual trickery/illusion).