interesting. They have them in stock at LA currently and list them as moderate care level. I always have trouble with the reef safe "with caution" label because it's too general of a term. Sometimes it means they definitely eat coral x, but not usually y or z. Other times it's they might eat anything but not always and I've even see sometimes where it say it's because they will pick at feather dusters and clams. Without more detailed information it's basically Russian roulette.
I used to have an Atlantic longnose in my sps tank. He never bothered any coral. He was a challenge to get eating prepared food though. Seemed to prefer just hunting on the rockwork for pods/worms I guess. I lost him unfortunately. Introduced a Tomini tang that was a little bigger than him but he kept trying to pick a fight with it. The Tomini finally got fed up and fought back. The buttefly lost and never recovered from the injury. I'm hoping to try another in this tank. I see them occasionally on LA, KPaquatics, Fishybusiness, and Bluezoo. It's been a month or two since I saw them last though.
