If you turn on the "Siri Shortcut,"
Siri adds the contacts that you called on SkyPhone as suggestions of the Siri Shortcut.

If you turn off the "Siri Shortcut,"
Siri doesn't add the contacts that you called on SkyPhone as suggestions of the Siri shortcuts.
Besides, the suggestions which were added previously will disappear.

With the suggestions, you can make a shortcut to call a SkyPhone contact more easily on the Shortcuts app.
Note: Please check the App Store to see the supported OS versions of Apple's Shortcuts app.