they say it’s really 19 fibers in one ... It’s not that insane in perspective

The impressive bit being that the bundle of 19 fibres is around the same overall diameter as a single regular one - "diameter of five-thousandths of an inch (0.127 millimeters), which is the same thickness as most existing single-fiber cables already in use" - meaning those individual strands are unbelievably thin.
It's going to be interesting to see how a cable like that is getting fixed in the field when a backhoe inevitably goes om nom nom on one.