Yes, and they probably spent $1M developing it and used every film possible to test it, unlike what most do. It is probably also patented. So, a simple change in time and temp to an existing developer might not work, but a total redesign might.
The process for paper at that time was using 6' development at 85F. We found that by removing Cadmium and Mercury, the emulsions in single layers developed in less than 3' at the same temp, so we aimed for 3' at 86 as all processes were using that in the '60s. We also had to change a lot of other things.