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With d-mail he runs that risk because he can't predict what will change, but time leaping just transfers his memories to an earlier point in the same limeline so assuming he is only leaping back to a point where the equipment exists he knows the timing of most events and it is relatively safe (everyone else will do exactly what they did the first time unless his actions change what they do). It can't change the divergence level so it's useless for his overall goal, but unless he destroys the equipment himself or indirectly it will still be there.
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