Campbell was a man. I don't take ANY man's word over Scripture. I have shown you where the meaning of the word used in Scripture is "immersion", not sprinkling or pouring. But you don't want to believe the truth, because the your preconception does not agree with the truth.
In Heb 9:19, the word for "sprinkled" is "erantisen" in Greek, so we can exclude sprinkling from the possible definitions of "baptizo". In Acts 2:17, the word for "poured" is "ekcheō", so we can exclude pouring from the possible definitions of "baptizo". The meaning of "baptizo" is to immerse. That is why John was at Jordan "baptizing", because that is where there was much water. That is why Phillip and the Eunuch went down into the water. Any of the Eunuch's servants, or Phillip himself, could have gone and gotten the water to pour or sprinkle over the Eunuch without the Eunuch going into the water himself, if that had been the mode followed by the Church in the first century. But that is not what Scripture tells us happened. Both of them went into the water, where the Eunuch was baptized (immersed), and then they both came up out of the water.
This is also consistent with the explanation given in Rom 6:1-7 where we are told that we are buried with Christ in baptism to arise to new life. When you bury someone, do you simply sprinkle a little dirt over them? Or pour just a shovel full of dirt over the casket? No, it requires complete immersion in the ground, either in a hole filled in with dirt like we do today, or in a cave that can be sealed as they did with Jesus.