The question is not odd at all. Windows 10 Enterprise LTSC 2019 is supported until 2029: https://learn.microsoft.com/en-us/lifecycle/products/windows...

Also, MS does absolutely support EoL versions of their OS - it took MSVC's STL until 2024 to finally drop support for Windows 7 (whose final ESU update was 2023): https://github.com/microsoft/STL/issues/4858 - it isn't unlikely that they (STL maintainers) are not going to get approval for dropping Windows 10 support before 2029.