That probably increases the fiber and/or the protein content, which actually does make the bread healthier. I’m not saying that the formula is perfect and they are changing values around to make it better. But the system is so simple that the only way to game it is to actually make your products better.
Nutriscore was never meant and never advertised as an absolute measure of healthiness. It was always meant to be used to compare products in the same category. I agree that toast should not have an A but it doesn’t mean that it is healthy, only that it is healthier than bread with a worse rating. I agree that the values in the formula should be updated so that toast has a lower rating than whole wheat bread but that doesn’t mean the Nutriscore is useless.