the sentence "I said as much." in the end of a paragraph

Without other context to go by, yes.

Joe(We love whole paragraph examples.)Nation

It does not exatly mean "I have already said that". It means "I declared the state of affairs or set of facts that I just described."

E.g.

We were talking about Joe. He is an alcoholic and a thief, and I said as much. (I said he is an alcoholic and a thief)

oh, i see. Thanks a lot