It could have been a one-off but I doubt it. They have the same staff all day, so the 2 key workers for the room also eat their lunch with the kids, they don't have a different supervisor for lunch time. I'd expect they'd either always do it or never, not just once.
Besides, he leaves there at the end of this week but the new nursery in September definitely have the grapes-cut-in-half rule. Although they haven't yet posted out the lunch rules to me I know parents who already have kids there who know the lunch policy and now slice grapes and cherry toms since receiving a complaint letter from the school when they didn't slice them.
I was thinking kiwi and spoon too Ali, not sure DS would have the patience to dig it out with a spoon but I'm going to try it over the summer break.