Who are you talking to?
The summary states that 90% will continue to remain the minimum requirement for success, as it was before.
The "unrealistic expectation" was making promotion decisions based solely on the difference between 93% vs 95% on the test score. A 90% was the equivalent of a "D". The problem was that to be promoted, the expectation was to hit that 2% difference (which may very well be a single question on the test) and that would mean the difference between being promoted or not being promoted (which means a host of different responsibilities). It's nice to have a firm metric you can point to in order to justify the decision that was made.
The problem is that the single question out of many, was the deciding factor between 2 candidates to take on a multitude of increased responsibilities, their qualification for which may not be accurately gauged by a single question out of many on a graded exam. For comparison, let's say you have 2 programmers take a test, programmer A gets 93%, and programmer B gets 95%. They both clearly have a very strong grasp of the requisite knowledge, which would you promote? The 95%? Well what if programmer B has excellent book-retention, but is lazy and disorganized in his personal and professional life? Maybe he has poor leadership skills over the people that he/she oversees? The idea of promotion based on a tiny difference in already-strong test scores starts to fall apart.