Below is a quote from an article Scrum software development:
Since 2009, a public document called The Scrum Guide[18] has been published and updated by Schwaber and Sutherland. It has been revised 6 times, with the current version being November 2020.
Why is the present perfect used in "It has been revised 6 times"? Why not the simple past tense? Could the simple past tense be used here? What would be the difference?