this cargo bike doesnt' need a linkage arm to stear the front wheel. it just uses break cables. pretty ingenious
But I do wonder if you hit a pot hole if the wheel will get out of alignment more easily. Looks like it just works on friction?
If you look at 3:36 you can see what looks like a filed down nipple that presumably is replicated on the other side wire. This stops it pulling through in theory. I'd rather trust a rod and rod end myself.
If the cable can't move it should be OK. It will get a lot of work but it should not be hard work. A few interesting concepts in the design. I wonder if the name is a deliberate play on English "car gone". A light carry box, laced fabric. Should sell a few as they look like pretty ideal suburban shopping trolleys.