The poison is a bicyclic polypeptide that shuts down ribosomes in your liver. Destroying or removing the poison is as difficult as destroying or removing all the protein. (like dealing with mad cow prions) It's just not going to happen unless you like your mushrooms charred pure black all the way through. Well, that or dusty white ash.
Just half a mushroom will kill an adult human. This isn't something to take chances with.
Right, my protocol would have been: fully homogenize the mushroom, treat it with an antibody known to disable all the toxins, then cook and eat. I wasn't really proposing anybody does this.