(Also, Scikit-decide seems to be on the Github account of Airbus, so I assume they have at least some basic knowledge of how aviation works.)
"Firms like Jeppesen have offerings in this space, but Scikit-decide, together with a narrow- and wide-body fuel consumption model built by a professor at the Delft University of Technology and wind data from NOAA, offer an open source solution."
So this is being positioned as an open source alternative to commercial offerings, which clearly it is not. If instead he made the limitations clear from the outset, that this is just a demonstration of what he/the tools are capable of and that this is not in any way intended for real-world use, it would put the rest of the article into better context.
I also don't see how Scikit-decide being developed by Airbus gives OP any domain authority. I use open source tools from all sorts of commercial ventures, and know nothing about how they themselves use them, or what for.
The truth is that given the legal and ethical constraints available, routing is already relatively well-optimized in many places. (There are some places, like China's hybrid civilian-military airspace, where those constraints are extremely nasty and basically make the problem impossible to solve better than it is.)
Aviation tries to solve the fuel consumption problem by designing planes to use less fuel, rather than by flying more optimal routes. There is a massive effort in aviation pretty much all the time to try to use less fuel, for every reason from cost to environmental impact to the relative accessibility of jet fuel now and into the future. It's the reason engines have gotten physically larger; it's a big part of why we don't use supersonic jets anymore as well.
The efforts have been pretty sucessful: https://theicct.org/maximizing-aircraft-fuel-efficiency-desi...
There's no hubris in identifying a problem, and fairly little in thinking you might be able to help solve it, but there's a good bit in imagining nobody else has done it.