Actually it is the world which has its sins being taken up in atonementLike I said you have not proved the op not to be true. Jn 1:29 is a world that has no sin charged to it.
Atonement being a provisionary measure effective for those who accompany it with faith
And if you look at the industry standard lexicon BAGD
5. the world as mankind (Sib. Or. 1, 189)—a. gener. οὐαί τῷ κ. ἀπὸ τῶν σκανδάλων woe to mankind because of vexations Mt 18:7; τὸ φῶς τοῦ κ. the light for mankind 5:14; cf. J 8:12; 9:5. ὁ σωτὴρ τοῦ κ. 4:42; 1J 4:14 (this designation is found in the inscrs., esp. oft. of Hadrian [WWeber, Untersuchungen z. Geschichte des Kaisers Hadrianus ’07, 225; 226; 229]).—J 1:29; 3:17b;
William Arndt et al., A Greek-English Lexicon of the New Testament and Other Early Christian Literature : A Translation and Adaption of the Fourth Revised and Augmented Edition of Walter Bauer’s Griechisch-Deutsches Worterbuch Zu Den Schrift En Des Neuen Testaments Und Der Ubrigen Urchristlichen Literatur (Chicago: University of Chicago Press, 1979), 446.
You will see it includes John 1:29 along with John 3:17b under a meaning of mankind