Earlier quoted context omitted.
It was an argument in the recent Apple vs Samsung court battle. Samsung's prior art was dismissed, one of the jurors explained that it didn't count because the software of the prior art phone would not run on a modern phone.
That sounds quite arbitrary, and if anything, it's the first time I've heard about this "principle".
In a just world, this would constitute grounds for an appeal by Samsung all by itself, but I've no idea what the legal position is.