Nice story, but:
The same technique for recovery from a nose high wings level unusual attitude is covered in the Boeing 737 Flight Crew Training Manual and applies to most aircraft types in general.
In principle yes. But not even the best pilot in the world could land that B737 (or any other contemporary type) with a jammed elevator the way this Tiger Moth was landed. Undoing 60 degrees of bank a few metres above the ground while the nose starts to come up again - and all that at stall speed - requires a very subtle balance between power and low-speed pitch and roll rates. And even this guy was extremely lucky that his elevator didn't get jammed another inch further up...
But what this story really tells to everyone is that there is a good reason why one must not take passengers on technical flights!