Any question answered...

In their case, they have the tool clamped in the bench vice though, so they'd need a torqe wrench that slides over the crank arm or something silly.

I reckon they've just shown the photo of how to remove it :)

50Nm is fucking tight. I've guesstimated it before with the large park tool 'shifter' and a good chunk of my body weight. And nobody has died.

If you wanted to you could borrow my large torque wrench and maybe Bicycle Workshop's bench vice. Would mean a walk over to notting hill though.