Which makes sense as you want your house to be as inedible as possible.

I assume they have some method of keeping snails, woodpeckers and other animals resistant to the poison at bay.

Amanita muscaria is not inedible, it just needs to be processed correctly.

I happen to know a person who experimented with eating dried caps and I don't think there exists a process that actually makes them harmless. Unless of course you're isolating muscimol, but I don't think that should count as eating the fungus.

While liver damage is mitigated by the fact that the organ in question regenerates, nerves don't.

I happen to be a person who ate the dried caps directly and experienced not only no ill effects but no effects whatsoever several times.

Which is why I carry around a pocketful of snails.