Where did the PS2 Prototype come from?

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I just found out about the PS2 prototype and read all the information about it (though I was pretty disappointed).

I know it was leaked back in January 23rd, but who leaked it? And where did they dump it initially? I can’t find a source on who did it.

Thanks!
The prototype was brought from AssemblerGames by YouTube user MattJ155, who then dumped it onto MEGA. In case you wanted it, I cannot provide a download link as it violates Donut Team's rules.