Does "Reset this Xbox but keep games and apps" erase singleplayer saves?

As long as you are connected to xbox live then all of your saves are copied to the cloud as well as saved on your console.

If you've done a reset the next time you start a game it will sync with the cloud & get your latest save.

If your Console is connected to the Internet, Your Saves are Uploaded to the Cloud. All other Informations you finde here

If you’re ready to reset your console to the factory default settings, follow these steps:

1. Press the Xbox button
   to open the guide.
2. Select System > Settings > System > Console info.
3. Select Reset console.

1. On the Reset your console? screen, you'll see three options:
   • Reset and remove everything. This option resets the console to factory settings. All user data, including accounts, saved games, settings, home Xbox associations, and all games and apps will be deleted. You should use this option when selling
     or gifting the console to someone else. You should only use this option as a last resort in some troubleshooting cases.
   • Reset and keep my games & apps. You should use this option as your primary choice when troubleshooting. It will reset the OS and delete all potentially corrupted data without deleting your games or apps. This will save you from downloading
     or reinstalling the large game files. In some cases, if a corrupt game file is causing the issue you're troubleshooting, you may have to choose
     Reset and remove everything, but you should always start with
     Reset and keep my games & apps and save Reset and remove everything as a last resort.
     
   • Cancel. To back out of this screen, simply select the
     Cancel button. No action has been taken at this point. This is a safe exit from this screen.
     

i hit reset this xbox and selected

“ keep games and apps but erase all accounts saved games but keep games installed “

and it powered off but loaded back to the original screen im posting about ! cooooome on man

Does factory resetting erase game saves?

Thanks that's not listed as an option. (Keep games and apps) has a disclaimer (Erase all accounts, saved games, settings, and home xbox associations, but keep installed games & apps).