That's not a fundamentally bad idea. It's also interesting that they focus on modeling and simulation. That's what Alan Kay thought personal computers were going to be for. But all we got is the VisiCalc/Lotus/Excel world. That's useful, but limited.
The problem with visual programming languages has usually been that they don't scale. You end up with a huge collection of lines and boxes. (For a good example, find a game implemented with Blender's game engine and open up the wiring diagram.) They have a chance of solving that problem, because program interconnection has made some progress since the days of Hypercard and UNIX pipes.
There are a lot of line-and-box programming systems in domain-specific areas. LabView, for industrial and research control systems, is one of the most successful. But no one has yet solved the scaling problem. On larger problems, things just get too tangled.