LADbible is even worse than the daily mail, I refuse to click into the link
To be fair, off-peak (outside June-September)) holiday destination flights can be quite cheap and trains are very expensive on peak times, I'm sure for every one example of the above you find, you'll find 1000 ones where the opposite you find.
Plus this is one of many many articles, at the end of the day nobody really gives a crap, it's like telling the cashier at a supermarket about your new pet, just pointless information.