Nigelondraft,
You would be correct, Ryanair cabin crew, are allowed to order an evacuation, with structual damage, if there is no response from the flight deck, and if they believe, the flight crew may be severlely injured or dead.
It is intended, I believe, more for a break up, or crash.
In this instance, IF, the aircraft, came to a halt, with gear in tact, their SOP's would prevent them from ordering it.
They would be standing by for the Captains announcement.