What do I need to do to get ready for Sept 30?

[nayelyz (SmartThings Developer Support)]

@JDRoberts

The hubs that act as Wi-Fi mesh routers, on the other hand, continue to have some issues so that’s a little unclear.

For Wi-Fi Hubs there was a firmware release to support Edge drivers. The only issue reported is about LAN drivers that use multicast to discover devices but those for Z-Wave or Zigbee haven’t been reported. If you see a report about Wi-Fi Hubs, please let me know.
The post you linked is from 2021, the release was in July this year:

Samsung Connect Home/SmartThings WiFi Hub Firmware Release Notes - 0.43.05

We will be rolling out Samsung SmartThings Hub firmware version 0.43.05 to Samsung Connect Home and SmartThings WiFi devices on Monday, July 11. This firmware update is for the SmartThings Hub portion of these devices and does not affect the router functionality. Once downloaded, the SmartThings portion of your hub will briefly go offline as the update is applied during this time the router portion of the device will continue to function. We will update the status page when the release is complete. Hub Target: All Samsung Connect Home Models Samsung SmartThings WiFi Release Date: 11 July 2022 ~ 25 July 2022 This hub firmware update requires your SmartThings Wifi or Samsung Connect Home to be running the most current firmware version for the router portion. If a new router firmware ver…