I had thought the point of a mixer was to mix your coins with other peoples, not just your own. Surely this defeats the point of a mixer if you're just running CoinJoin with yourself?
It's not a coinjoin. You get different coins than the ones you started with.
Ok, well whatever software/protocol was used, the hacker simply got back what they put in, as was responsible for all the inputs (-1) - hence got all the outputs (-1).
That's not how ChipMixer works.
This is assuming it was an online mixer that was used, and that the website had 11K BTC liquidity ($5 million back then)? To me they look like simple transactions that consolidates funds.
This topic is about a 0.256
BTC transaction, which has nothing to do with whatever happened 8 years earlier.