The only thing that was added to that profile, was the stickers at the top, which are stating that it is unsourced, which makes everything uncertain. Pre-1700 profiles are not supposed to be created unless they have 'Reliable Sources' included
The birth date is estimated since the date on the top does not match the date in the biography. When an Estimated Date is included, the profile should use the {{Estimated Date}} template so everyone knows the Date is estimated.
You changed the Birth date in the top part on May 13 from 1591 to 1596 but you did not change the biography (lower part) at the same time. Reviewing the Changes Log, you can see who has changed anything and what they have changed.