Firefighters don't necessarily have to be out there for fires, but as precautionary measures.
So again, firefighters don't unequivocally equal fire. Device failure? Yes, evident. Project failure due to a panel failing? Not necessarily, it's just a step in the process of making them more reliable, and if one part failing meant a project was doomed, there would be zero progress whatsoever.
Fire? I want video evidence, which apparently was possible since there's a live feed on the panels. If someone does not have a video of the fire but just takes a still of the firefighters and are saying, "Look! See? Fire!" then I'm calling clickbait.