I don’t think this is true. All the people who got stuck in the 1980s retired. The people I know who write in-house Fortran codes are somewhere in F2003 (all of the multidimensional arrays and allocatable variables niceness, some objects and QoL improvements from F2008/2018). None of them still writes in fixed form, and most of them never did at any point in their careers.
Based on the comments, it seems it is very field dependent. My experience is mostly from physics/electromagnetics. All my fellow grad students learned Fortran 77 as that's what the code bases were in. I should ping the few that are professors to see if they're forcing their students to behave likewise.
It's absolutely true in some domains. I've got several million lines of F77 and no money to update it and an absolute mandate not to change a single compiler flag.
