I have not looked myself, but ... people who reviewed the leaked MS source code remarked that it was unexpectedly clean with almost no profanity or inside joke

I have not looked myself, but ... people who reviewed the leaked MS source code remarked that it was unexpectedly clean with almost no profanity or inside jokes. I think this was mostly true for leaks from software companies. Modeling code from academia, whether it has to do with weather prediction or covid prediction, however, appears to be (to put it lightly) subpar -- the covid 19 model that prompted the original lockdown was apparently using uninitialized variables and was non-deterministic. (And ... independently, was also completely wrong because of wrong assumptions - e.g., on 1-apr-2020 it predicted 95,000 dead in Sweden by 1-july-2020 if super strict lockdown is not enforced. The death toll on 1-july-2020 was 4,800)