Just because it's still being maintained does NOT mean it's not antiquated and does NOT mean it's a good use of taxpayer money.
I cant say more as I was sworn to secrecy but lets say some very stupid contract operators had a large part to play
PARIS the in house system was updated for 20+ years quite successfully never missing a run.
And you do know that for serious HPC a lot of work Is still done in the venerable Fortran (look at job adverts for CERN) and yes people use Python for some of that now as well but the Libraries that do the heavy lifting are Fortran ones.