Why is the Memory Card used an element tracked in Animal Crossing speedruns?

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Was browsing some speedruns on Speedruns.com and saw something weird. https://www.speedrun.com/ac#All_Debts
In Animal Crossing speedruns, the Memory Card size is tracked; just like other things like language played.
Do the Memory Card used change anything in Animal Crossing Speedruns? Or is that information tracked for seemingly no reason?
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What does the Animal Crossing memory card do?
Memory Cards are the data storage devices used for the Nintendo GameCube. The amount of memory in a Memory Card is measured by blocks. It takes 57 blocks to open an Animal Crossing save file, plus 1 optional block for NES saves, and 1 block to receive a special letter, containing two NES games, one K.K.Do you need the Animal Crossing memory card to play?
The Nintendo Switch saves all game save data to the system's internal storage, and never to the physical game cartridge or connected SD Card. This means you cannot use any SD Cards or different forms of game copies to bypass this restriction.Does Animal Crossing come with a memory card?
2021 Nintendo Switch Animal Crossing: New Horizons Special Edition - 6.2" Touchscreen Display Bundle with 128GB Micro SD Card.Animal Crossing: Completed Museum Speedrun 9:37:17 [WR]
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Images: Skylar Kang, Brett Sayles, Angela Roma, David Selbert