As I mentioned, they use established tools in the decomp scene to check 1-to-1 replication already, and that's how they get their progress reports. getting to 100% means that this tool has checked every single function in the game versus their decomp and everything outputs exactly how the game does. regardless of AI use, that means this decomp is 100% complete, and the next step is for folks to take this and build recomps/mods/remakes with this(hopefully without AI)
the difference with decompilation and recomps is that decompilation mostly uses AI to again, pinpoint things quicker and find what they need to replicate. It's an entirely different situation than using GenAI to generate NEW code to build recomps, which is what we DONT want in this case