Hilarious aside, it would only work if you don't actually use multiple keyboard -- otherwise an additional one would make switching between multiple keyboards very annoying [*].
It also mentions some other changes like adding RU keywords to your registry. Again, these measures would have many side effects since lots of software actually use these registry entries for legit reasons. So I don't know if this Cyber Scarecrow product would have this problem, since it does modify registry, too.
1: https://krebsonsecurity.com/2021/05/try-this-one-weird-trick...
*: A little rant: as someone who use three virtual keyboards (English, Chinese, Japanese), it is already a pain in ass to switch them since MS does not follow "last used" switching order (like alt+tab). Instead, it just switches in one direction.