https://learn.sparkfun.com/tutorials/how-to-install-and-setu...
Even then, it was pretty limited: 100x80mm board size maximum, only 2 layers, 2 schematic pages, for personal use only, but Kicad was pretty hard to get configured. Altium, Cadence etc. were still the industrial behemoths.
But now Eagle is among the behemoths, owned by Autodesk. It requires a subscription and an Internet connection, the subscription is free for one year, and then costs $495/year to continue to get access to your files on Autodesk's cloud. One hazard I remember from projects at school in 2010 was that the school had an education/commercial license from Cadsoft (the original manufacturer) and you were essentially unlimited in the schematics and PCBs you could create. However, if you created a design on your laptop in the freeware version, opened it with a school computer using their paid license, you could no longer open it on your freeware license - that's a pretty old bug (or feature, depending on your definition. I trust that when Sparkfun sends back Eagle files, they're able to be opened by people with a "Fusion 360 Personal" subscription Eagle license.
Kicad is much, much easier to use today, especially after the big development push from CERN. And it's open source, so whether Sparkfun would want to extend it with Python scripting, write a plugin, or modify the software itself, something like this could be trivially automated.
The choice of Eagle seems to be obsolete by half a decade, when you're looking for a open-source-hardware electronics CAD package, especially if you'd want it to be scriptable and extensible, as I'm sure Sparkfun ALC is (I can't imagine they're paying someone in Colorado to route traces for $950). On the other hand, there's a lot of institutional inertia when all of Sparkfun's early designs were created in Eagle. Sparkfun is one of the big drivers of hobbyist Eagle adoption. I wonder if any early discussions of how to implement ALC were guided by an in-house Autodesk rep...