Harry writes that he found out about the Queen Mother's passing away (in March 2002):
"At Eton, while studying, I took the call. I wish I could remember whose voice was on the other end. A courtiers I believe. I recall that is was just before Easter, the weather bright and warm, light slanting through my window, filled with vivid colours. "Your Royal Highness. The Queen Mother has died." "
News reports at the time reported he was skiing in Switzerland with Charles and William. The Queen Mother died on 30 March 2002. Easter Saturday. He wouldn't have been at school.
news.bbc.co.uk/1/hi/uk/622457.stm
Recollections may vary, indeed! I doubt very much Harry would have taken the call if he's been with his father.
Didn't the editors do any fact checking?