This is my recollection as well. I guess there could have been a reference to Hackers at some point too, but Hackers had been neither a popular movie nor a legendary fiasco so it doesn’t strike me as the sort of movie people would be referencing even a few years after its release. Wikipedia tells me that Hackers (like Superman III and Office Space) does involve a “salami slicing” scheme, but circa 1999 I think all most people knew about Hackers was that Angelina Jolie was in it and it was a dumb movie that had something to do with hackers.
As for the OP, if Office Space looks like the '80s to you then I’m guessing you’re too young to remember much about the actual '80s. The characters aren’t people who’d be wearing the trendiest new styles of 1999, but for regular office workers (many middle aged) it looks about right to me.