oh i'm sure state of the art has advanced since then. i have the necessary physics background, but it's not otherwise my domain: i once used xfoil to design an airfoil for an autonomous model glider as a hackerspace project back when i had free time for things like that many years ago. the glider was also loaded into x-plane to develop and test the autonomous part. so whenever various experimental aircraft projects popup, i'm likely to look into them, and then also notice the peculiar foils they use.

Because Fortran was the industry standard for any heavy scientific calculation (like aerodynamics or nuclear bombs), the Fortran compiler has been optimised to death... And thus Fortran is still the industry standard.

FORTRAN is easier to optimize than something like C so is much used for numerical computation

It really depends. Up until the 90s Fortran was completely dominant. These days a lot of people have moved to C++. Important open source codes such as OpenFOAM and SU2 are in c++.