Well they did mention it early in the movie. There was a project Bruce was keeping secret from even Morgan Freeman himself. It ended up being the super sonar compter friend finder. I agree about the bullet thing though. That shit was non-sense.
Even if we gave him the time factor, shits still nonsense, the general theme is "well he has infinity dollars so just buy into it" and again ill state, i buy into it, i really dont care other than arguing against, what I believe, are false assumptions about tdk. I have not seen the film but i got the impression early alot of negative reviews seemed to be put the film as a contrast to tdk and i thought "what movie did you watch?" (in reference to tdk).