"Marosszeky says that in most cases pilots can avoid flying into dangerous conditions. In this particular case, I am a little bit surprised that the aircraft took off and flew into these known conditions," he says.
According to his profile that 73to91 posted, Peter Marosszeky has spent years working in the engineering, teaching, management and regulatory aspects of aviation, so his word should be trusted on that.
But he has never been employed as a commercial airline pilot, or even has a pilot's licence (according to the profile), so it is beyond his knowledge to judge what a pilot should or should do with regards to diverting around storms.