﴿ كَذَٰلِكَ سَلَكْنَٰهُ فِى قُلُوبِ ٱلْمُجْرِمِينَ ﴾

“Thus have We caused this [message] to pass [unheeded] through the hearts of those who are lost in sin:”

So in the same way in which We would have caused denial of it to penetrate the hearts of disbelievers had it been recited by a non-Arab We have caused denial of it to penetrate the hearts of the criminals the Meccan disbelievers when Muhammad (s) recites it.