> The requirements [to possess sufficient knowledge of the German language] shall be waived if the foreigner is unable to fulfill them due to a physical, mental, or psychological illness or disability, or due to age.
That is kinda the point of the article, countries create these arbitrary rules to prevent people that create value in their society from permanently participating.
Whats slightly ironic is you don't have to speak Vietnamese, even raised in a Vietnamese home, or have Vietnamese parents to have Vietnamese citizenship. Many racially Vietnamese students attending international school only know English, because English is spoken exclusively at home and their school.
Or if you're Hmong, you might not know Vietnamese, but can hold a Vietnamese passport.
Same situation in the USA where many Americans couldn't pass our citizenship test.
Washington State is grappling with this issue now: we have very wealthy people that created a lot of wealth for themselves while residing in the state, and now are taking it to Florida, due to the Washingtonians voting to increase taxes on wealthy people.
> The requirements [to possess sufficient knowledge of the German language] shall be waived if the foreigner is unable to fulfill them due to a physical, mental, or psychological illness or disability, or due to age.
[0] https://www.gesetze-im-internet.de/stag/__10.html