In the last sentence of the first paragraph, the author repeats the word "presumably" in order to.
This refers to the repeated use of a word or phrase in a given sentence or context, usually for dramatic effect.
With this in mind and from the complete text, we can see that the connotative meaning of the word "presumably" to show that what was being said was not certain and this is used to undermine a view that he would go on to dispute in his argument.
Read more about connotative meaning here:
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