Dell has quietly posted an update on its support website for the XPS 15 9570 titled "Modern Standby Performance Improvement Package Application". The 66.94 MB update promises to fix Connected Modern Standby being enabled by default, a change that Dell previously claimed required re-installing Windows 10. The company labels the update as urgent, with it apparently updating machines to BIOS 1.12.0 too. The update is available to download now.
https://www.notebookcheck.net/Dell-contains-to-bait-and-switch-XPS-15-9570-owners-over-Modern-Standby-sleep-issues.433715.0.html