وَلَا يَنْبَغِي أَنْ يُخِلَّ بِشَيْءٍ مِنْ هَذِهِ الْكَلِمَاتِ
Translation: One should not leave out any of these words.
Yukhilla means to cause an omission or defect. Al-Quduri emphasises preserving the transmitted wording.
This should not be overextended into an automatic ruling that any minor pronunciation difference invalidates the whole Hajj. Legal sufficiency and correct recitation require their proper distinctions.