Should be denounce one whom he saw eating by mistake in Ramadaan?

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Check below answers in case you are looking for other related questions:
Prisoner having intercourse with Wife during the day in Ramadan
He drank after the adhaan thinking that dawn had not yet come

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Related Answers:
You do not have to remove your braces in order to fast
Ruling on having intercourse with one's wife during Ramadaan
He wants his wife to break her fast and make it up later for no reason
Prisoner having intercourse with Wife during the day in Ramadan
He drank after the adhaan thinking that dawn had not yet come

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