No, not ", including sideloading."

It's ", including installing software". Lets not let the enemy of general purpose computing define the framing of the discussion.

This article isn't about the installation of regular apps. The "sideloading" it's referring to is the option to use the "adb sideload <OTA file>" command when booted into recovery mode to install OS updates. The functionality being removed is being able to install a proper OEM-signed OS update from a local file.