"Why is this news" is almost always an unnecessarily provocative "high-heat low-light" question. It's more substantial to point out mitigating factors and add missing context, as you also did.
I read it as a metaphorical nod to light bulbs: an inefficient light bulb spends most of its energy toward heat while producing little light. Instead of producing illuminating discussion, a "high-heat low-light" question produces flames.
What does that mean?