That's from the 2.5 manual....I don't think it's relevant any longer. I'm not sure which update it was, but I believe you can move presets around more freely these days.
As long as the units are up to date with firmware, you should be able to export an HX Effects preset, then load it into the LT for further editing.
NOTE: I only own an LT so this is how I just tested it.
I download an HX Effects preset from "customtone" and loaded it directly into both NATIVE and into my LT via HX Edit. Both imported without issue. My LT, Native and HX Edit are all up to date (3.01 as of writing this)