Actually, when Jörg mentioned the five nines, he was only talking about the availability of the “distribution layer” (think “CDN” or “file servers”), as opposed to “our servers and services” (ie. the Xbox Services and Asobo components of the MSFS backend).
The latter only “perform as expected”. Maybe they have low expectations. Or their telemetry doesn’t cover the issues we’re encountering.
source: Microsoft Flight Simulator 2024 November 27 Update - Microsoft Flight Simulator
Edit: I just noticed that whoever wrote the Development Update made the same mistake, mushing the two statements by Jörg together.
The MSFS2024 servers and related online services are now performing as expected with greater than 99.999% reliability.