That might be correct, although I would've thought they would put the diamonds on the individual lines like in the course spec, but that might've been more confusing.
However, it seems that the diagram should be read from left to right, but in B, module 3 is executed before module 2, which doesn't make sense if read in that way. But it's been some time since I last read one of these diagrams so I might be interpreting it wrong.