The bolded sentence should be removed because:
- It provides info that is off topic - The sentence discusses how Peruggia snuck inside the museum while it was closed for cleaning, which, while related to the theft, distracts from the main narrative of the theft and recovery of the Mona Lisa. The focus should remain on the crime and its resolution rather than the specifics of how he accessed the museum.
While option 2 (redundancy) could be considered if similar points had been made earlier in the paragraph, the sentence isn't necessarily redundant. The third option (unnecessary personal info) doesn't apply as well, since the information about Peruggia is relevant to the story. Thus, option 1 is the best reason to remove the sentence.