Skydiver breaking the sound barrierPhoto credit: Jean-Pierre Tessari

I’m slightly confused as to how this happened.
Human terminal velocity: about 120mph
Speed required to break the sound barrier: over 770 mph
Can someone please explain?

https://www.guinnessworldrecords.com/records/hall-of-fame/felix-baumgartner-first-person-to-break-sound-barrier-in-freefall#:~:text=An%20unprecedented%20eight%20million%20people,space%20of%20just%20three%20hours.

Ty