The illusion is much rarer than the familiar. Consider yourself lucky. The item is heirloom so you can move it around through shared bank. But yes, item description may need an update.
Verified. The "Claim the Item" spell - 47334 is used on all of the claimable items from the Teir`Dal crate, but has a spell description that only makes sense for the familiars. This text appears if you inspect the spell and it doesn't affect which reward you will receive. I can correct the text, but the clean fix would be changing the Teir`Dal crate rewards to use the new-and-improved item reward system instead of a dummy spell and a script.
