I see why you'd think that. In fact what happens is this: the -ν merges in a funny way with ξ- resulting in δε-γκζέρω. I know, right?!
A tip: the audio files are created with text-to-speech software so the voice will pronounce everything that's written. For a listening exercise where you're not sure what you've heard, you meed to also factor in the rules: here, the ruel is that the final -ν is always present (i.e. not dropped) before ξ.