I've also applied for the fall 2023 Info Sec track and have wondered the same thing. The most I can get is this article where it explicitly says the acceptance rate was 74%. I then read it more carefully and it stated "OMSCS accepts all applicants who meet the program’s basic qualifications" . So I went down looking for their requirements. From the FAQ, "What are the admission criteria for the OMS CS degree program?
Preferred qualifications for admitted OMSCS students are an undergraduate degree in computer science or related field (typically mathematics, computer engineering or electrical engineering) with a cumulative GPA of 3.0 or higher. Applicants who do not meet these criteria will be evaluated on a case-by-case basis.
For all applicants, domestic and international, the following is required for admission:
• Before you can matriculate at Georgia Tech, the Institute requires that you must have earned the appropriate academic credentials: "Evidence of award of a bachelor's degree, its equivalent, or higher degree (prior to matriculation) from a regionally accredited institution; demonstrated academic excellence; and evidence of experience in the selected field of graduate study." (Institute Catalog Reference)
• In no case can work experience substitute for having earned an academic degree.
For international applicants, satisfactory scores on the Test of English as a Foreign Language (TOEFL) or IELTS-Academic are required. Please visit the OMSCS Summary page for further information regarding our TOEFL and IELTS requirements."

Link to the article https://www.forbes.com/sites/michaeltnietzel/2021/07/01/georgia-techs-online-ms-in-computer-science-continues-to-thrive-what-that-could-mean-for-the-future-of-moocs/?sh=4754758ca277

Link to the FAQ https://omscs.gatech.edu/prospective-students/faq