[DavidPlumpton]

Yudkowsky is more of an expert in reasoning than in Physics. For example, imagine you are a world class expert in Quantum Mechanics and you are asked to give a talk at a science club. You cover a lot of stuff and think "that was great". But somebody else tells you "that was terrible, you mumbled, you wrote illegible stuff on the board etc." and you realise it wasn't about QM, it was about public speaking.

Similarly physicists have done amazing work over the decades, and now it's time to draw conclusions from all that evidence. But it turns out that physicists are not domain experts in drawing conclusions from evidence. That kind of skill is a separate domain in its own right.