an immutable black hole might as well be a shredder. the OP in the reddit did precisely that. that money is GONE. locked away forever. it has not been transferred to anyone else.
Indeed, an "immutable black hole" could be described as a shredder, agree. But that's not what that address is. The semi-official "black hole" address for Ethereum is 0x0000000000000000000000000000000000000000 (https://etherscan.io/address/0x00000000000000000000000000000...), currently has $29,461,295.02 worth of ETH in it. Any other (valid) address is just another address on the network.
"It's not a black hole, because black holes are collapsed stars, which is clearly not what we're talking about."
This is basically the style of argumentation being used here. Frequent equivocation over the terms "valid" and "black hole" to avoid addressing anyone's actual point.
No one sent any currencies into a "shredder", so not sure why you're asking this question?