As I read it, this pertains only to transfers. The preceding paragraph is referring to transfers, as is the paragraph containing the sentence about the counters and bookmarks. Only that one sentence has no mention of them.
But if this feature is not restricted to only transfers, possibly only the manager of the player can see how many other managers have a player bookmarked. For instance, if I bookmark Theodore Eller (which I have done to see if this may work) then only you would be able to see the bookmark; and not other managers.
I still believe these changes are restricted to transfers though.