Technically correct for some coal plants. Coal has minute quantities of Hg. Clean coal technologies are removing the Hg and apparently mitigates the problem. Nadel can take his twisty bulb & go play with it till it breaks.
I understand that coal has all kinds of nasty stuff in it, including Hg....if not virtually every element in the periodic chart!
Do you think that a coal plant producing 100 watts for the life of an incandescent bulb produces that much mercury? I suppose it’s possible for some types of coal. I also understand that 5.5 gms of Hg, being pretty heavy, does not occupy much volume.