From the article you link:
> Scholars have interpreted Cassius Dio's wording to indicate that the fire did not actually destroy the entire Library itself, but rather one or more Library warehouses near the docks.[87][81][8][89] Whatever damage Caesar's fire may have caused, evidently the Library was not completely destroyed.[87][81][8][89][3] The geographer Strabo (c. 63 BC – c. 24 AD) mentions visiting the Mouseion, the larger research institution to which the Library was attached, in around 20 BC, several decades after Caesar's fire, indicating that it either survived the fire or was rebuilt soon afterwards.[87][8] Nonetheless, Strabo's manner of talking about the Mouseion shows that it was nowhere near as prestigious as it had been a few centuries prior. It is unknown whether this was due to historical decline or catastrophic destruction.[8] Despite mentioning the Mouseion, Strabo does not mention the Library separately, perhaps indicating that it had been so drastically reduced in stature and significance that Strabo felt it did not warrant separate mention.[8] It is unclear what happened to the Mouseion after Strabo's mention of it.[60]
> Further evidence for the Library's survival after 48 BC comes from the fact that the most notable producer of composite commentaries during the late first century BC and early first century AD was a scholar who worked in Alexandria named Didymus Chalcenterus, whose epithet Χαλκέντερος (Chalkénteros) means "bronze guts".[90][87] Didymus is said to have produced somewhere between 3,500 and 4,000 books, making him the most prolific known writer in all of antiquity.[90][82] He was also given the nickname βιβλιολάθης (Biblioláthēs), meaning "book-forgetter" because it was said that even he could not remember all the books he had written.[90][91] Parts of some of Didymus' commentaries have been preserved in the forms of later extracts and these remains are modern scholars' most important sources of information about the critical works of the earlier scholars at the Library of Alexandria.[90] Lionel Casson states that Didymus' prodigious output "would have been impossible without at least a good part of the resources of the library at his disposal".[87]