"Limited Longhorn" was the old trim's name. There also "Laramie Longhorn".
My Limited (not Longhorn or Laramie) had a tag on the leather seats that said thank for you buying a Laramie Longhorn truck.
The "Laramie Longhorn Edition" was introduced at the State Fair of Texas way back in September 2010.
Fast forward to the spring of 2018, when I ordered a 5th-gen Laramie Longhorn from my local dealership. I took delivery in September 2018 of what was probably the first Laramie Longhorn in town to arrive loaded with RamBoxes, Off-Road Group, eTorque, etc.
I had the seat tag you are speaking of, but of course my truck actually is a Laramie Longhorn. Of course, the Limited seats use exactly the same leather supplier and grade...just a different set of colors and patterns.
Anyway, the trim line wasn't rebranded to "Limited Longhorn" until the 2021 model year, when Ram announced the "Limited Longhorn 10th Anniversary Edition".