Sonic the Hedgehog 004 (Archie)

From Sonic Retro

"This issue mistakenly refers to Rotor Walrus as Boomer and uses Sally's original pink style."

How is calling him 'Boomer' a mistake? That's what he was originally called. Unless there's inconsistency with issues earlier than #4 (and I don't have them with me to check), I don't think this is a "mistake" of sorts. Can someone clarify rather he was called Boomer in earlier issues or not?