The wikipedia article seems to concur with you, although this seems to be a voluntary policy by CUII, the members could still decide to not wait for any court orders and block whatever they want.
It's not voluntary anymore, it's required.
this is not a requirement, they're just asking. The BNetzA just wants to not deal with it apparently.
See also the recent CCC talk: https://media.ccc.de/v/39c3-cuii-wie-konzerne-heimlich-webse...