Yes. You could get around that by first obtaining the 9th level spell and destroying or binding the Snarl, but to do that you'd have to convince Redcloak that he wasn't giving up everything by destroying or binding the Snarl. Convincing Redcloak that your side is acting in good faith is the hard part.
Also, this is all assuming that the planet isn't the Snarl and vice versa (as Odin said, "yarn winding yarn"), but that's another topic.