The intended mechanism for doing this does not work. That thread lists the only workaround, as even creating your own custom ToC listing (which requires you to add your own links, and is meant more for cases where not all of your sections should be listed rather than simply moving the location of the ToC in the page flow) doesn’t work. It refuses to accept where you put it, and always relocates it to the very beginning.
Here is another more recent thread with more discussion.