When i say unofficial emulators im talking about emulators for pc. Project64, PCSX etc.
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From https://kb.speeddemosarchive.com/Rules
Emulators commonly allow for recording games frame-by-frame and then playing back the input at normal speed. Emulators also give the player access by default to features not present on the original consoles, such as RAM-watch or the possibility to use, for example, keyboard as input device. Finally, many emulators have minor inaccuracies in timing and slowdown that inhibit accurate comparisons between runs.
Emulators commonly allow for recording games frame-by-frame and then playing back the input at normal speed. Emulators also give the player access by default to features not present on the original consoles, such as RAM-watch or the possibility to use, for example, keyboard as input device. Finally, many emulators have minor inaccuracies in timing and slowdown that inhibit accurate comparisons between runs.