You are quoting an 8 year old article that is filled with half-truths and isn't relevent to why they are thinking of restarting production. There is credible interest from a number of countries in acquiring some, they aren't doing it because they feel like it or because the SAAF would like to have more.
Furthermore its avionics have been improved since it was first produced to its current incarnation ie. Rooivalk Mk1F. It is also typical for most military computer systems to be surprisingly old when the systems are first introduced, heck even the F-22 Raptor has 90's era hardware. Its a fact of military development that doesn't seemed to have been solved.