I have read them both, and whilst I grasped the gimmick in Turbulent Term early on, I didn't spot it in Gentlemen & Players so quickly, and I was hugely irritated by it in the Joanne Harris book. I thought it was stretching the idea too far the way it was done. But then I don't much like Joanne Harris books generally.
Classes in primary schools should still read Turbulent Term - a real classic.
When a writer consistently avoids certain common words - including certain pronouns - it begins to come over a bit stilted here and there, and when it's sustained over a long period it goes beyond coincidence, iyswim. I've recently read another book that uses the same trick and I sussed that one out quickly too - the misdirection seemed obvious to me.