Yeah, really interesting. I've only seen these tubular leaves associated with terminal spikes in which case the crown can't grow, but in your case because there is no terminal spike from what I can see, and the removal of the leaf is allowing new ones to grow.
Have just added a photo taken one month later. We can see that the leaves seem to be growing to normal size, but the "stem" is slimmer and a bit to the side. But, seems that my phal has recovered. And yes, Rosie, there was no terminal spike, I guess that's why I was able to do this ! Can't wait to see the flowers, have no idea what they are !