That seems less like "Armor", and more like a "Giant Robot". As for tarvek's confusion, well Wulfenbach's are well known for their Oversized Machinery (too lazy to find comic).

Still, I have a feeling that's Agatha. The Armor's speakers apparently distort the voice enough that he can't tell, but I don't see how it can be Gil unless we're about to flashback to Gil's Miraculous Escape.
The Armor has a Heterodyne Trilobite on it, which means it's probably mechanisburg made. It's Huge and ornate, which means it's probably leftover from a previous Heterodyne, not fresh-made.

Yeah, my guess is that this is Agatha.