I haven't seen what the developer's response is, but I think ExplorerPatcher may be on the way out. Experimental builds of Windows 11 have a toggle to completely disable the Windows 10 taskbar code so that ExplorerPatcher either loads the Windows 11 taskbar anyways or Explorer crashes.
You are correct.
Quoted from Neowin, Nov. 30, 2023
"As spotted by @PhantomOfEarth on X (Twitter), Windows 11 build 26002 contains a hidden feature called DisableWin10Taskbar. As the name implies, it makes it impossible to fall back to the Windows 10-era taskbar. Moreover, enabling the ID breaks third-party apps, such as StartAllBack or ExplorerPatcher.
"Windows 11 build 26002 ships with DisableWin10Taskbar turned off by default, so you need to enable it manually with the ViVeTool app. Therefore, it is hard to tell if Microsoft indeed plans to block Windows 11 users from restoring the old taskbar. Future Windows 11 preview updates will most likely give more insights into the matter."