If that's an intentional backdoor it's a very weird backdoor. Wouldn't you at least obfuscate things a little bit? Simply mixing up the characters in that string in some pre-planned order would be enough.
While I doubt it's an intentional backdoor, I wouldn't assume that backdoors would be obfuscated. You can't deny knowledge of an obfuscated backdoor, while an obvious one could plausibly be a simple mistake.
