وَإِنْكَارُهُ وَادِّعَاءُ اسْتِحَالَتِهِ إِنَّمَا يَنْبَنِي عَلَى أُصُولِ الْفَلَاسِفَةِ
Denying the event and alleging its impossibility are based on the principles of the philosophers.
The objection particularly targets an older cosmological picture in which the celestial spheres were considered so fundamentally different and resistant that opening a passage through them was declared impossible.
This is a historical cosmological premise, not a settled modern scientific rule. The theological reply asks that the premise itself be demonstrated: a miracle cannot be ruled out solely by assuming a disputed philosophical model.