Delayed: Windows 11 23H2 is not available via the Media Creation Tool because Microsoft is busy with 'size optimization'
Microsoft recently made Windows 11 23H2 available to those who are willing to seek it out, with an automatic roll out due shortly. The company has also released Windows 11 23H2 (or Windows 11 2023 Update) as an ISO image so it is possible to create installation media manually.
But for anyone who has been hoping to use Microsoft's Media Creation Tool to create installation media automatically is in for some disappointment. The availability of Windows 11 23H2 though this route has been delayed.