this is relevant info I took from the Ryan air website a few moments ago. In case my quote isn't allowed, it's basically saying not to go to the airport.
Passengers scheduled to fly to/from these airports during these closure periods are advised not to go to the airport but instead change their flight bookings (or request refunds) on line at http://www.ryanair.com.
Can your son get access to the internet from his hotel. He'll be able to see it in black and white for himself and maybe even show it to one of the reps who are advising otherwise.