There are different opinions on what 'reef safe' means. IMO, they are not reef safe because they will consume many animals commonly kept in reef tanks. It will feed on hard shelled invertebrates, including sea urchins, snails and hermits.
But the greater issue is that they get very large, and, because they are predators, they produce a lot of waste. This is why I tend to argue against putting large predatory fish into reef tanks. They can overwhelm a DSB/LR system, because they are often overfed, and kept with other big waste producers.
You can also never judge the personality of any given fish based on the experience of a few others. The instinct of this animal is to eat shelled inverts. That is a fact. Whether yours will do this or not is not known.