I'm Trying to create a Dhampir beast master ranger with the natural combat style. Am I right to understand that the improved empathic link replaces the Entire 6th level feats or can i still take any of the 6th level combat style feats?
You get the link instead of the "free" combat style feat you'd normaly choose at lvl 6.
These feats are not barred from use to you. You can still take them at every odd level and gain them as a normal feat (thus you have to fulfill the prerequisites for them!).
What Krodjin said is correct, the rules speak of adding the feats to your list of total combat style feats available - when you take which feat is completely up to you.