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Technically only for non-classified internal communication. Classified stuff is restricted to be discussed only using military approved locked down hardware. But still, issuing a strong recommendation for Signal above all other options when communicating using regular devices is a good thing. Lots of “regular” conversations can still leak more than you expect through metadata, timing, etc, so they trust Signal to protect that
Not unless turned into EU law, or a lawsuit over it reaches EU court. Individual countries can’t change the rules of the union on their own.
There’s already EU court precedence against mandatory backdoors
https://cdt.org/insights/the-european-court-of-human-rights-concludes-encryption-backdoor-mandates-violate-the-right-to-private-life-of-all-users-online/