Yes, it is an error, i noticed that too. It is definitely ruby but it is a batch of its own for this release, no doubt. The ruby in these are absolutely stunning! According to a rep i spoke to, they did a batch of extremely red ruby lenses for this release.
Yes, as of recently, fire and ruby iridium have began to look somewhat the same (with the exception of these lenses). That is the best way to tell the difference by looking through them. Fire iridium has a greenish tint when looking through, ruby has blue tint.