"What's the weather in Berlin." "you need to unlock your phone to activate location service services"

Works for me. Turn on "allow Siri when locked"?

If it doesn't know where you are then you might live in a Faraday cage.

Their point is that Siri is not consistent with these things. If you've never had these issues yourself then good for you, not everyone is as lucky.

I have had the same issues myself. The "allow Siri when locked" toggle for my phone is set to on, yet it still often refuses to do stuff like turning my home lights on/off, giving the reason that I need to unlock my phone.

And I've also had the location issue they gave an example of, where asking "what is the weather in Berlin" does not need it to know where you are because you've told it the location you're asking about, so the answer is the same regardless of whether you're asking while in Berlin or Tokyo, yet it still sometimes gets stuck believing it needs location access.

Edit: oops the issue of having said a location in the request wasn't in the comment you replied to, but another reply to it. But the overall point of Siri being annoyingly inconsistent still stands.