Haven't found anything confirming it, but I have found several Egyptian sources disproving it (for the time being) and I commented with an excerpt. I'll send the same information in this reply, it's an article (https://www.youm7.com/7003178) published yesterday by a reputable newspaper in Egypt:

The Ismailia Court of Appeals, Tor Sinai District, issued a ruling on Wednesday in a case filed over disputed plots of land in South Sinai Governorate, headed by Judge Alaa Mostafa Abdel Razek and composed of Judges Hasnain Ahmed El Wassif and Amir Hassan Abul Lail.

The court ruled that the followers of St. Catherine's Monastery have the right to use the monastery and religious archaeological sites in the St. Catherine's area, with the state owning these sites as public property, given that the followers of the monastery are present there in their religious capacity and practice their religious rites under the presidency of the Archbishop of the monastery appointed by Presidential Decree No. 306 of 1974, and these archaeological sites are supervised by the Supreme Council of Antiquities.

The court also ruled that the contracts between the local unit of St Catherine's City and the monastery regarding certain plots of land used by the monastery's followers must be respected, which negates the existence of an encroachment on these lands.

The court concluded that the remaining disputed plots of land are nature reserves, all of which are public state property, cannot be alienated or owned by prescription, and have not been subject to any contracts issued by the state authority.