Assalamualykum.
Correct, there are different interpretations, as you have pointed out already.
The question arises, why do we still commit sins if the Shaytaan is locked?
1) Scholars explain that after consistently committing a sin it becomes intrinsic and thus the evil whisper of the devil is no longer required.
2) We also have within us lust, referred to as the nafs, if not curbed, is influential in our committing of sin, which is present in the month of ramdhaan as well.
Jazakallah khair
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