Yes, but too bad it's not entirely accurate. There was a great need -- at least in England -- to be rid of the mercenary elements that were increasingly disrupting society. There were a lot of bored knights wandering around with no one to fight. (Imagine Lear's retinue writ large, and you'll have a good sense of the problem.)
Simply put, the Crusades gave these fighters something to do. I can see no evidence that England felt any threat whatever from the Saracens. The Crusades were many things, but they were not defensive actions. In that I disagree with this author.