Digging a bit deeper, it appears they use it to deliver specifications and example code to vendors?
"[T]ransferring the specifications to industry using this legacy system required three different types of documentation: first, the specifications were written both in variable-based pseudocode and in English descriptive pseudocode. But this approach left gaps in interpretation, leading to possible confusion or disagreement. So programmers also created state charts to fill these gaps and eliminate the potential for misinterpretation."