A2, I believe you - and anyone, doesn't require login - can get that information by using the "view history" tab.
Not as easy as you have to search and locate the interesting change in the history log, but as Traumflug pointed anything in the page content can be edited by anyone, so you cannot use it as trusted data.
Most of my technical comments should be correct, but is THIS one ?
Anyway, as a rule of thumb, always double check what people write.