Thanks for that Kick the tyres, missed that bit! I admit to being not much of an expert on Ryanair cabins as I sit front left for one of their rivals, actually several of their rivals when you take our wet leasing into account!
I have seen aircraft that looked like they were from Ryanair (e.g. 90% colour scheme) operating for others. Most recent one seemed to be flying for EL AL. I have no idea on what basis, but presumably leased given the colour scheme.
But the journo makes a fair point that the aircraft are less attractive to others. Makes you wonder if taking the seat pockets off and other such innovations is such a great idea!