Main arguments are a matter of interpretation, so your second sentence opposes, rather than supporting, the first.
Summarizing is interpretation, since it is relaying the important points of the source, and determining what is important is a matter of interpretation.
We might have different definitions of the word "interpret". According to Google, interpret: 1) explain the meaning of (information, words, or actions). 2) understand (an action, mood, or way of behaving) as having a particular meaning or significance.