Well, in real football, the defense has a very good idea if the offense is straight "going for it" on 4th down, due to the personnel group and formation, so the CPU suggesting plays to counter it is not unrealistic.
I had not noticed the suggested plays including "safe plays" or fake counters just when the CPU was planning a fake. Maybe I missed it, but I know I have been caught unawares by CPU fakes a couple of times (though, in once case, my punt block play led to a sack on the fake before the CPU could get the pass off).