Yup, and the Chord Mojo is something insane like 0.037 ohms.
Even FiiO stuff has <0.5 ohms output impedance. Even the Apple stock headphone dongle has low impedance! Only ancient designs or straight-up crap has anything several ohms, or mobile phones. This "losing the headphone jack" thing is a good thing, because it forces people to use off-board devices that do things properly.
Multi-driver IEMs can get really bad with 1 ohm impedance. The Shure SE846 has its lowest impedance around 2kHz, so it can sound really odd if the output impedance isn't mega low.
EDIT: The SE846 is <8 ohms from 2kHz-10kHz, bottoming out at 5 ohms at 5kHz. While the Drop Plus would just sound muted in the highs, the SE846 would have this weird, hollow mid/treble profile.