It appears not; one of the exceptions to the loss of citizenship at 22 is "If loss of Danish nationality will make the child stateless".
If I read it correctly, that's required under the Convention on the Reduction of Statelessness (http://en.wikipedia.org/wiki/1961_Convention_on_the_Reductio...), which Denmark's signed, and which commits a state to "grant its nationality to a person, not born in its territory, if either parent had that State's nationality and the person would be otherwise stateless". But in any case it's also part of Danish domestic law.
If I read it correctly, that's required under the Convention on the Reduction of Statelessness (http://en.wikipedia.org/wiki/1961_Convention_on_the_Reductio...), which Denmark's signed, and which commits a state to "grant its nationality to a person, not born in its territory, if either parent had that State's nationality and the person would be otherwise stateless". But in any case it's also part of Danish domestic law.