Not really an issue; the force is absorbed over the entire tube and not at a particular spot. The issue by looking at his pictures is that the forks do not seem to fit tightly to the SSQA on the machine. If such is the case it's just a matter of time before one side of the forks come off the SSQA again.
The tube is small and the forces great. It will twist no matter what. It's designed to twist as it is, else it would be a much larger rectangular box shape. The strength comes from the attachment being firmly attached to the plate. Look at his images w/ the forks, you can see what looks to be a gap between the bottom of the wedge/pin deal that sticks down into the attachment. When he goes over rough terrain and the attachment bounces, there is a risk for one or both sides coming loose from the SSQA point and it will be the same issue all over again.