I agree this reads like fiction, and it would be idiotic to admit it.
If real, the people he stole from may be even less ethical than he is (and they must have noticed the ETH were gone, and at what time). This could paint him as a murder target, a position I wouldn't want to be in...
They must be very angry and powerful to do that, because the common criminal rule is that you pay all debts of the person you killed. Otherwise it would be too easy to take money from the debitor/thief at the right moment and then send someone bury him in the basement without any consequence.
except it is possibly a grey area, the contracts are written such that extracting the money is only possible if you fulfill the contract, if you find a loophole and fullfill the contract and take the money did you really steal it?
With the usual caveats (IANAL, this may vary per country/jurisdiction) laws and contracts are usually about intent, not pure semantics. And you'd probably have a hard time to argue that this way of 'fulfilling' the contract was the intended way.
I understand that contracts are usually written this way but an ethereum smart contract is a different kettle of fish. It is written to be a program so if you can get the program to respond to your inputs then you have fulfilled the requirements of the smart contract as it was written. Of course it may be that it was poorly worded but that is an issue for the contract writer.
Because whoever invented them called them "smart contracts" doesn't mean they're considered as such in the jurisdiction where people using the said "smart contract" are living. Matt Levine has written extensively about the subject.
It certainly seems to have elements of parody, though if it were about the DAO specifically, I would think he might have said something about hard forks.
https://etherscan.io/tx/0xff261a49c61861884d0509dac46ed67577...
he is probably role playing because i doubt whoever did this would put themselves at risk by claiming they did it publicly