That config for the Eldritch Lands dimension ID was eventually removed (dunno why). I just forgot to remove it when I updated Thaumcraft a long time ago. If you refresh the config you will see it doesn't exist, so there is no need to change the Last Millennium dimension ID. I will remove that in the next update.I also noticed that Thaumcraft's Eldrich lands are dimension -104, so I had to change the ExtraUtilities id from -104 to -110 for the Last Millennium dimension.