I think it is a non issue. It is such a certain set of circumstances that need to happen that the chances are so slim. If you by chance seem to be on an already compromised network than I think you have more issues than the chance that you keyboards language pack might update.
"must be connected to a compromised network (such as a spoofed public Wi-Fi network), where a hacker with the right tools has specifically intended to gain access to their device. This access is then only possible if the user’s keyboard is conducting a language update at that specific time"
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