SF developed and ran the school, based on their special reconnaissance experiences from early on in the war before big Army green machine arrived. 1st Brigade of the 101st was one of the early US Army conventional units to deploy there, and they soon realized they needed a dedicated reconnaissance capability at the Brigade level.
The Army LRP units were actually a 1950's creation in Germany for the Fulda Gap, so that a long range surveillance force could be emplaced along the MSR's, and provide early warning for motorized and armored columns entering the West as part of a Soviet spearhead invasion.
I met an SF officer this summer who stood up 101st's first LRRP Detachment, after having already been in Vietnam since the early 1960's. He did 6 tours there, and retired out of SF after a full career spanning the globe.
When he was in SF, he trained a lot of Chinese mercenaries, who were then recruited by SOG for better pay, which made him upset, since SOG was basically getting them killed at an alarming rate. He couldn't pay them what SOG offered, and they could only see the short-term benefits for their families in pay, which was sent home ASAP.
Anyway, there are a lot of basic lessons that Recondo embodied, which were watered down and lost in subsequent generations, unless you really studied what they were doing back then. They covered cave man tech up to mission planning and coordination with air assets, deception for insertion and extraction, and a list of skill sets that were 100% practical and mission-oriented, versus Army BS, which is 100% fluff and duff.
The linked article in the OP shows some of the unique evidences of that, including the fact that there weren't enough slots in the school for as many LRRP's that needed it. The modern day closest equivalent of this course is run by the Ranger Training Brigade at Benning, and was known as LRSLC when I was in. I think they have re-named it. It stood for Long Range Surveillance Leader's Course, and taught most of the same skill sets as Recondo did.
A lot of the Recce community TTP's come from coalition partners in Europe. The Brits were some of the best soldiers when it comes to Recce. There is also a school in Germany that teaches these things to coalition SF and recon units, with a multinational cadre composed of SF and Recon NCO instructors who love the skill sets, and are dedicated professionals. Both LRSLC and the school in Germany were staples for NCO's in LRS when I was in. They are far more appropriate schools for the job than Ranger School or the SF Q-Course, although all the NCO's in LRS were tabbed in my unit. We were actually 190% over-strength on Ranger-qualified NCO's in Lima Company, 52nd Infantry, Long Range Surveillance, before General Crocker deactivated us.
Motivation, reenlistment, and retention was much too high for big Army to allow. Can't have highly skilled soldiers who actually love and enjoy their jobs. We actually had a company mourning formation before we parted ways to the four winds. Most of the guys that stayed in went to SF and other units well outside of the conventional Army, which was common in Vietnam as well. A few SF Teams had guys that didn't like it when a LRRP SSG showed up with more operational experience than them. Guys went back and forth even, gaining their own recon on what commanders were GTG in several communities ranging from LRRP's, SF, to SOG.
I learned early on that leadership personalities make a good unit, not the type of unit.