Don't know where that 155lb limit comes from, it sure doesn't fit the hang gliders I have flown, which are a set of hollow aluminum tubes with a nylon fabric cover, and since you mostly launch by lifting the glider off the ground and running downhill with it, it would take an awfully strong person to do that with anywhere near 155 lbs. I have never weighed one, but just a guess a normal hang glider might weigh 30 lbs?

As for one occupant, well paragliders, ( parachutes) are often flown here tandem and I think sometimes though rarer, hang gliders may be also. If that FAR means hang gliders then they should say it in plain English.