Or maybe somehow this works for some reason and

Well you don’t sound like an asshole at all, but technically it is plausible. One can clown mushrooms much the same way one clones cuttings, but it’s not exactly the same thing.

Mushroom clones are done by taking a piece of the mycelium and then growing it on a sterile medium, like an agar plate.

That mycelium will then build “a new body” of which fruiting bodies (the things colloquially called mushrooms) could come out of.

So technically, technically, you could just stick a piece of mushroom on a medium and it could take it over and then fruit. But to have that actually work feels like a one in a million. I’ve purposefully tried growing shrooms and while I’ve had a few successes, I’ve had a lot more failures. Usually because molds are pretty much present as spores everywhere, and they’re more vigorous than the shrooms I’ve tried propagating. So the medium you prep usually gets colonised by mold, not the mushroom you’re trying to propagate.

So with OP’s instructions, a vast majority will just get a moldy pot. And OP says “a mix of compost and soil” when neither is a sterile growing medium.

To grow shrooms usually one uses an organic medium like rye seeds, rice, popcorn kernels, even coffee, but only after it’s been sterilised in a pressure cooker or with another method.

Then one introduces either spores or a bit of the mushroom that one is cloning. If it’s a bit of the shroom, then it should be a sterile as possible bit of it, so like a tiny wedge from the middle of the body.

Mushroom growing is a hobby that requires very meticulous hygiene, not something you just slap in a pot. Plants are much less demanding.