There are dozens of points that can be made from this video.
Hobie 14,16, and 18's can be sailed for fun in this kind of wind once you know how. Many races over the years have been held in similar conditions, but with waves.
This is meant for informational purposes and not criticism.
A good captain should first brief an inexperienced crew. Explain to them that if they go over to make very sure to hold on to the boat because they will not be able to swim as fast as the boat will drift. Tell the crew that if the captain falls off the boat to dump the sails and head into the wind. Also when out on the wire to hold onto the chicken line and keep the jib sheet in their hands and be ready to dump the jib.
If they go over in that wind the crew should hold onto the low hull in front of the main beam because 1 person can easily right the boat. Once sure the top hull is coming down the guy on the righting line should go for the bottom hull in front of the beam. You don't want to end up under the tramp. it can be a battle to keep the boat from tipping over the other way so you need to be ready for that.

His jib track should have been all the way out and the jib was over sheeted for what they were doing. Sure the tell tales were flowing, but his main was back-winding. Use the main first then the jib. Especially on a H16 because the mast can counter rotate the way they were sailing which can cause it to break whilst double trapping.
His rudder cams looked like they could be tightened judging by how easily the rudders were popping up.
It is possible to single hand a H16 in that wind from my experience (155lbs). You can sail to windward and tack. The jib is luffing some what and the main traveler is down past the hiking strap; maybe all the way out. You need to be out on the wire and you can build up enough speed to tack(back tack). Gybing to go pick up your crew that is upwind of you is not a good plan. Turtling the boat may have slowed down the drifting. A sea anchor sounds interesting, maybe in conjunction with turtling. You better be confident the mast doesn't leak though.
Generally you should tie off the outhaul on the boom in that wind because you aren't going to be using it and it can slip. You want that sucker as tight as possible.
His downhaul looked like it could have been a bit tighter also. In that wind you want to depower to the max so that you can be aggressive.
That is enough for now. thanks