I understand that Lena thinks they're dead, but she doesn't recognize the voice too?

I get that he couldn't hear her voice until she activated her upgraded PARA-RAID and he picked it up too (the entire system is based off of his powers in case anyone forgot, and the Federacy's new comm systems are based off the old PARA-RAID), but she didn't recognize the voice directly off his mech's loudspeakers?

Cyclops knew the second she saw the emblem.