> Oddly, the update claims to re-enable Disconnected Modern Standby when Connected Modern Standby is active, something that Dell previously stated required an OS re-install to do.
The update probably only switches from Connected Standby to Disconnected Standby, both states of S0 Modern Sleep. The difference is only that internet is disabled. But this doesn't necessarily stop modern apps, drivers and the OS kernel from doing something they deem appropriate during sleep. And the way Microsoft designed MS, users can't prevent them.
The thing that presumably requires an OS reinstall (by Microsoft) is switchover to S3 sleep, which isn't mentioned in the description of this update.
Btw, a computer may also wake up during S3 sleep for "important things" like Windows updates. But there, wake timers can be turned off using powercfg command options.