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I see it like this:
This musician: Hello, I'm a foreign citizen. Can I enter you country to spread this message among your citizens?
Germany: No.
I think it would be completely fine to block manosphere influencers, antivaxers, holocaust deniers and white supremacists from entering like that so I have to agree that stopping pro-Palestinian activists is also fine. It's part of the governments policy, not some fundamental right. If Germans disagree with this policy they can elect different government.
It's different for German citizens, they do have the right to talk about anything they want. Foreigners don't simply have some fundamental right to enter Germany as they wish. Not sure about EU citizens but here we're talking about UK.