Haven’t seen the movie, but if the goal is to read a single 8" disk once, it wouldn’t surprise me that, with modern tech, were easier than creating a disk. A McGyver construction would leave out the spindle motor and the stepper motor for the read head. You can manually rotate the floppy at about the right speed, manually move the disk head to find the positions of the tracks, record the signal and then do signal processing on you multi-GHz laptop to recover the signal.