Yeah, I'm not sure! I know these CGMs tend to get approval in Europe before the US FDA approves them, but I also know that the US lets you buy a lot more stuff over the counter than you can in Germany.
I hope you're able to collect a bit more data about this! If nothing else, knowing you were a little low even after eating a meal can be a useful if you want to try to help your energy levels with some carbohydrates.