You say that this was fulfilled when He came in 70 AD but His coming then was just not in the flesh. Well here is what John says about your confession:"Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God, and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world." [I John 4:2,3]
John was referring to the original coming, the incarnation, in opposition to false teachers who maintained that he only seemed to be a man.
The text does not limit itself to the original coming --