"..So even though someone doesn't look anything but human there are gears inside them." Someone being Hajime. That explains the smell.

Also, gross. She wants to believe that their supplier targets angels that are still with corporate, but she's realistic enough to know that they're probably not. Single targets that are on the run anyway are a lot easier to take down and dissemble.

It's a bit like looking at a bunch of second-hand cyberware from shady sources, just more obvious.