Grant, could please have a look here: https://forums.nexusmods.com/index.php?/topic/3733385-need-help-getting-fnis-to-work-in-mo/?p=33950540 Apparently the OP has 2 Skyrim installations, and somehow they get mangled up.
Just to put things straight: If you are MistakenMystic on Nexus, then it wasn't me who answered you with the reference to the sticky. And it wasn't the same warning the op has posted. And you didn't post such a wrong installation path on Nexus. Looks like you really were tired that day.
I had certainly said something if you had added the necessary information. Here we are talking about an FNIS path "D>>games>>steam>>steam apps>>common>>Mod Organizer>>Mods>>FNIS Behavior 5.2>>tools>>". Right? If you look into gophers video, you will not see a path containing "Mod Organizer>>Mods>>FNIS Behavior 5.2". So: BAD INSTALLATION! The warning you can see in gopher's vids is the "non-legal" message. That's what I refer to in the sticky note. This happens when users always start through SKSE. That's when I'm referring to the sticky post. Because I think I have answered that questions dozens of times before.