An event occurs today, but it was not previously outside divine knowledge. Its external occurrence begins today; the divine attribute of knowledge does not begin today.
Likewise, a possible act being brought into existence concerns what power produces. It does not follow that God lacked power before acting and acquired it afterwards. Renewal of an object of relation must not be confused with renewal of the attribute.
This differs from human learning: a person who hears previously unknown news really undergoes a new state of knowing. Applying that created process uncritically to eternal divine knowledge produces a false inference.