I tried to install the "2025-05 Cumulative Update for Windows 10 Version 21H2 for x64-based Systems (KB5058379)" and it says "not applicable to your computer". Are you sure the links are correct. Never had this problem before.
I don't know enough to assign blame. I can only report what happened after applying today's Windows 11 update
1. My network broke. I had to update the Network Adapter driver.
2. Windows Update broke sort of. I had to restart my W11 device after the Windows Update completed in order for Windows Update to work again.
3. Microsoft Bing Weather and Paint needed to be updated outside of the Windows Store
4. Multiple Store apps required update though I had updated Store apps shortly before applying the Windows update
5. My W11 devices' needed defragging. Some may question the value of this.
6. There was a Security Intelligence Update along with the Windows Update. On one of my W11 devices the Security Intelligence Update appeard on the top and on the other it appeared below the Windows Update.
Anyway all is now GTG thanks to my handly utility software.