I don't know what do you mean with "appropriate Addons Linker folder", the one in your screenshots don't seem to be links, but rather real folders, which defeat the purpose of using the Addon Linker to begin with.
Not only that, by creating a real folder in the Community folder, you'll lose the ability to update, since the program will ONLY update in the ADDON MANAGER folder because, a proper FSDT installation is made this way, with the scenery linked TO the Community folder.
Basically, our installed already do what most people use the Addon Linker for ( creating a symbolic link in the Community to something that is installed elsewhere ), so no Addon Linker is even required to begin with and, it seems you reversed the process and used the Addon Linker to converted a scenery which was already installed in the "appropriate" way by our installer, into one that stays in the Community folder for real so, the opposite of what you'd normally use the Addon Linker for, which wasn't required to begin with.
So, remove every "real" FSDT folder now, install in the proper way ( which now can be done with JUST the Universal Installer ), and don't touch anything. You MUST remove any real copy of the folder in the Community, if you don't the installer won't be able to create a Symbolic link.
If you need to momentarily disable the scenery, the Universal Installer can do exactly that as well so, there's no need to do anything else with the Addon Linker.
Can I force FSDT to the folder I want the update to go to?
No, you can't and you shouldn't, because the way our sceneries for MSFS are installed is already the "Addon Linker way", without any need to use the Addon Linker, and all our installers/updaters only works on the Addon Manager folder, and that's the proper way, the Community folder shouldn't contain any actual files, that's why people use the Addon Linker, but we always installed that way, even before the Addon Linker ever existed.