My question asks a further explanation of how you come to say such a statement is incoherrent, contradictory and absurd.
If it is, the whole method is wrong from the get go, no?
Yes.
Doesn't he cite a "bent stick in water" as an example of our senses "fooling us"? If so, then this is obviously an error since we use the totality of our sense input, mediated through the central sense, to determine that a stick in water is not always where it appears to be to our eyes alone. This is not an error of our senses but rather an example of our senses and central sense working properly with regard to their proper objects.
That is, it is proper for the eye alone to sense light and color but not proper for the eye operating alone to determine the position of objects. It is the role of the central sense to use all sense data to determine whether a stick in water is truly bent.