>>40576591As someone that was digging through the dumps when this beta leaked, hopefully I can quell some misinformation.
So yes, the single piece of evidence I'd consider the most critical for confirming that these were real was mentioned in
>>40576694It's not that just that single piece of evidence was the only factor, but it's the big one that pretty much eliminates all other possibilities.
>>40576740The code wasn't always there. Garbage data from errors in the GB compiler wrote over the code necessary to handle the fade-in animation, and iirc by tweaking a few bytes in the ROM the animation can be restored. Because that part of the code is never called, it's basically impossible to find unless you already know its there. Knowing what bytes to change and what values to change them to in order to fix the issue is even harder. There's a reason it took until the beta, a version of the game that called these pieces of code AND had them fully functional, for this to actually be discovered. People didn't even manage to find the Wave animation until after the beta either, which was something unused that DID work, to put it into perspective how unlikely it was that anyone ever managed to find and repair some snippet of code that's broken and unused.
>>40576882It's not a ROM hack of any type by default because the RAM is chaotically shifted around in a way that's just not possible to do unless you compiled the game from scratch without using any base GS code. It's not even just like it being at different addresses (which it is, but afaik that parts easy to do with enough knowledge of the disassembly), but how the read/writes are called are different from either version as well, like how many bytes are allocated for a specific piece of information.
Additionally:
>>40577392>>40576900The demo reel footage at spaceworld was a different build than the actual game available for play, this was known even before the betas leaked.