Have they? As far as I'm aware, sleep states are "supported" in hardware well enough, but doesn't prevent software/settings from not using them correctly.

Not that I blame them, there are many different sleep states from core/package level [0] that map onto system/platform level sleep states [1]. Fucking confusing, and I'm sure something is waking it up. Have you checked Windows Task Scheduler? My college laptop had a Norton Antivirus scan wakeup at 5am every day and would be re-enabled every Windows Update, similar pain to you

[0] https://www.intel.com/content/www/us/en/support/articles/000... [1] https://www.tenforums.com/tutorials/63346-sleep-states-avail...