So, the matrix is helpful but doesn't explicitly lay out the information I am looking for, nor did @HelleK follow up with his results, just that the matrix was what he was looking for.
The Workstation 15.x matrix stops at Windows 10 1909. Well, we have Windows 10 21H2 and Windows 11 21H2, and all those in between. I am left to guess their official status. The Workstation 16.x document says Windows 10 and Windows 11 are supported as host operating systems, great, but I have Workstation 15.x and am looking for information regarding that specifically. Someone may say that they aren't updating the documentation to include that information since a newer version is out, but I argue that the document says last updated 04/12/2022. It would be most appropriate to include the latest version even if the middle ones are skipped to confirm or show specifically that they are or are not supported.
I am looking for something that explicitly calls out that Windows 11 21H2 is or is NOT supported as a host operating system for Workstation 15.x AND then separately is Windows 11 Guest OS supported on Windows 10 21H2 host running Workstation 15.x? I have a tough time going to management requesting upgrades when I am unable to show that what I have is insufficient.
Any help and further clarification is greatly appreciated. Please provide links to documentation if you have something else that would help me. Thanks!