A simpler, and yet more definitive reason Jesus stated to His disciples He was not going was He truly did not know if He was going or not. Remember, He did what He saw the Father was doing (John 5:19), He had already faced the threat of death the last time He went up to Jerusalem(John 5:13), and He knew it wasn't the "time" of His entry(John 7:8) into Jerusalem on a white donkey-indicating that David's Son would rightly take the throne.(1 Kings 1:38)
But just as He said to His mother, "My hour is not yet come"(John 2:4), so He said the same thing to His disciples(John 7:6), and yet the Father had other plans for Him; turning water into wine, performing His 1st public miracle in the 1st incidence, and going to Jerusalem in John 7:10.
Jesus did not 'lie', first of all, a 'lie' is a deliberate falsehood who's motive is to harm God or one's neighbor, secondly, He did what He saw the Father doing, and just like us, He didn't always see what the Father was doing ahead of time, He had to pray, like we do, and discern the Father's Will in a given situation-just like we do.
Jesus is the 2nd Adam, we forget that in talking about His Divinity, therefore He is the model and example of how we are to live out our lives daily.