A Harry Potter question...? please answer quick!!! need an answer! thank you!?

I am a big time fan and I honestly don't remember Luna saying that. However that's been my feeling from the time it happened - that Harry will find a way to rescue Sirius from wherever he ended up, and he isn't actually dead but trapped somewhere dangerous. The Order members either don't know this or just didn't tell him for fear he'll risk his life for his godfathers.