For people who don’t know, a “lane” in this case is a literal wire on the cable. You can have multiple lanes that have separate protocols, e.g. a lane for audio, a lane for DP, a lane for USB 3.
IIRC there are always lanes for USB 2, and USB 3 speeds are achieved on separate lanes. Thats why all USB-C cables and devices must support USB 2.0.