Maybe. I don't know how huge that project is. Maybe technologies that have been chosen are the best for the tasks at hand. Maybe some of those technologies are only minor part, not in critical area, maybe it is some technology research project. Maybe it is kind of managerial pride "let's write how many lines our source code contains". As well, I guess, you don't assume that software developers should learn new technologies on their own time (while I personally love to do that).