Chometz is already assur min hatorah from chatzos, the gemorah makes a drosha from ‘ach’ since ‘lo sishchat al hachometz,’ we learn from ‘ach’ to divide day in half, half day chometz and half day matzah. The chachomim just moved issur of owning chometz 1 hour back, and issur achilah 2 hours back.
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