I've read that ARS Technica article before. It states on the first page that every scrap of information on the Saturn V - including the Rocketdyne F1 plans - is still on file.
Given modern manufacturing processes, it was decided that creating a modern, accurate 3-D scan of every component of the F1 engine would be the necessary path towards reviving that design. A big, expensive project, but much more beneficial than transcribing blueprints.
See my immediately prior post - Pantex here in Texas recently ran into the same problem when attempting to overhaul some of America’s older nuclear warheads. Yes, they had all the plans and manuals on hand, but none of the staff could figure out how to refurbish the units let alone build another one from parts. There were several news articles on it at the time; several retired engineers had to be coaxed to come back in and train current workers.