Really? Those who have had anything to do with gliders know there is plenty that can and will go wrong. Landing on-tow !?!? And what's the benefit - they might save a little in cruise, but they've got to get there (safely) first?
Even assuming a full size one doesn't fatigue off the tail of the lead plane, presumably any time a plane towing one gets into difficulty, the first thing they'll do is cut the towed thing free.
Also the website sounds like it was written by an over-caffeinated estate agent.
“Oh sh1t!” at 35K feet.
It mentions it has a form of automated control in the tow with "Aerolane's patented Pilot Positioning Assist systems"