The Disable and Uninstall buttons in the extension setup page perform the corresponding actions on the C/C++ extension, not on the Pico extension:


I did press the Disable button and it really did that, it disabled the C/C++ extension and all dependents.
(FYI: The xPack C/C++ Managed Build Tools extension has nothing to do with the Pico extension, it depends only on the C/C++ extension.)
I guess this is the result of a copy/paste from the initial code, not updated later, and it shouldn't be that difficult to fix.