Microsoft says the ESU program is "not intended as a long-term solution but rather as a temporary bridge to stay secure while one migrates to a newer, supported platform."  Windows security ...

With Microsoft PC Manager, users can easily perform basic computer maintenance and enhance the speed of their devices with just one click. This app offers a range of features, including disk cleanup, ...

So, when you click "Update and shut down" on your PC, you assume your PC will install any available updates, then shut down.