Interestingly, most of that article is about the 737 Max issues (the MCAS software is a disaster, it's a push to even call it engineering).
As best I can tell, CFD is still kind of like impedance-based home body fat scales. They're kind of directionally accurate but have a pretty high error.
I thought CFD would be a solved thing by now, but then I remembered how good (e.g. bad) weather prediction still is.
Some people think that wind tunnels will be obsoleted by computational fluid dynamics within the decade. Others think that the problems with CFD are not a lack of compute power but a lack of comprehensive understanding and modeling of the physics at play, and expect that wind tunnels will be with us for quite a while. (Personally, I believe in the progress of technology and expect an eventual if not near-term breakthrough in CFD software will eventually obsolete the wind tunnel, but I also think that institutional inertia will keep a lot of wind tunnels and businesses that purchase time in them in operation for a decade or more after CFD's big breakthrough...)
https://en.m.wikipedia.org/wiki/Computational_fluid_dynamics
https://www.seattletimes.com/business/boeing-aerospace/massi...
The wings are assembled horizontally similar to the to A350.
“21st Century Jet” is a documentary about the building of the 777. Looks like it’s available on YouTube.