It's unique within our solar system, the only one we have details about. I think it's fair to state that as being unique. The implication (that we don't know about other solar systems) doesn't need to be stated, at least to me.
Since we're in the business of nitpicking – unique means one of a kind, so the "truly" is redundant. That said, there are so many planets in the Universe that it's practically impossible for any single one to be unique – the term is being used here not in a technically accurate way, but in a loose, "I want you to be impressed" sense.
>The largest planet in our solar system is truly unique.