AMD still supports S3 sleep on their Ryzen processors, but you'll need to check user feedback to make sure that the vendor did their job implementing it properly. In S3 sleep, the UEFI/BIOS is responsible for suspending and resuming hardware state. If not implemented correctly, you'll have high battery drain (components not suspended) or bugs on resume. Lenovo had dropped the ball on that front repeatedly, with the last two gens of T14 requiring BIOS updates to fix issues.