I doubt this is true. if we pick at details, the 10-trip transportation pass (T-10) in Barcelona is 9.80 €, meaning each journey is .98€.
Anyone who travels a lot knows that you can hop a free shuttle (until the new rail line is complete) to the train at the old airport, which takes you the the Sants station using 1 trip on the 10-trip pass. So the round trip is less than 2.00 €. In the article, he allocated £5 for the trip, which isn’t enough for a taxi to airport, and is more than the 2.00 € needed for a round trip on public transport to the airport.
But who in their right mind would want to fly Ryanair, or any other airline, every day?