SU15 is still in Beta.
Last Development Update:
Also announced during the livestream was an update on the Sim Update 15 release date . While we had previously revealed a tentative launch date of April 30, we now think an additional week of development time is necessary. This will be the last Sim Update for Microsoft Flight Simulator (2020) prior to the launch of Microsoft Flight Simulator 2024 later this year (but not the final Sim Update for MSFS2020 ever — SU_16 is planned for early 2025)
ref: https://forums.flightsimulator.com/t/blog-april-25-2024-development-update/639499
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