I just tried to start Skyrim using Skyrim4gb and I get this error message. Does this mean I don't need Skyrim4gb since the new patch has "Support for 4-Gigabyte Tuning (Large Address Aware)"?

Simply put yep.

Ya, it automatically does 4GB so the LAA/4GB mod is no longer needed

Yeah, confused me too for a second because I hadn't realized it had updated.

I've looked at the exe I keep downloading and it is indeed flaged "App can handle >2gb of address space" so that's swell for everyone else but I still can't start any of my games.