No, he did not actually state that they were fake.

He used the classic ploy of trying to sow seeds of doubt - he queried whether or not they are authentic.
Zuma does this all the time.

Just like Brown saying she met the Guptas 5 years ago, but not mentioning anything about all the other more recent meetings.

It is a question of telling the truth, just not the whole truth and nothing but the truth.

In law this is called an omission and can have the same strength as a blatant lie.