Job lists wrong after wrong that he says he hasn't done. Is he saying he has never sinned?

Job 27 asks this of his oath, "My heart will not reproach me so long as I live" (27:6), and sets beside it his earlier words about his own disobedience and iniquity (7:21, 13:26, 14:17). This chapter adds words of its own. Its ifs name particular things: falsehood and deceit (31:5), a neighbor's wife (31:9), his servants' cause (31:13), the poor, the widow and the fatherless (31:16-21), gold (31:24), the sun and the moon (31:26-27), the fall of one who hated him (31:29), the foreigner and the traveler (31:31-32), and his land (31:38-39). One if is about wrong itself: "if like Adam I have covered my transgressions, by hiding my iniquity in my heart" (31:33), "because I feared the great multitude" (31:34). What that if names is covering and hiding. These are all Job's words about himself. The chapter doesn't join them into one statement, and these notes don't either.