It could be argued that some berries fall into the flavours of Christmas, such as cranberries, but I doubt a beer using strawberries would present what are understood to be flavours of Christmas! I eat a banana every morning, including Christmas day, and I always have a smoked brisket ready at that time of year, but neither would be judged to be flavours of Christmas!
I guess the judge will push those that are reminiscent of Christmas to the fore during the process.
That said, it's a bit of fun and a way to make people rethink their brewing, whether they do a whole batch or a split batch. It's more about trying new practices and ingredients, so I'm happy whichever approach is chosen because I'm going to learn something.