Nutfah in the Quran is a generic term ie. a term (like samaa) which has multiple interpretations and the scientific interpretation depends on the context in which it occurs
eg Nutfah in A cannot be interpreted the same way as Nutfah in B.
There cannot be the same interpretation of Nutfah in all Quranic verses in which it occurs.
A-
75:37
أَلَمْ يَكُ نُطْفَةًۭ مِّن مَّنِىٍّۢ يُمْنَىٰ ٣٧
Had he not been a NUTFAH from semen emitted?
B-
وَلَقَدْ خَلَقْنَا ٱلْإِنسَٰنَ مِن سُلَٰلَةٍ مِّن طِينٍ ﴿١٢
23:12
And certainly did We create man from an extract of clay.
23:13
ثُمَّ جَعَلْنَٰهُ نُطْفَةً فِى قَرَارٍ مَّكِينٍ ﴿١٣
Then We placed him as a NUTFAH in a firm lodging.
23:14
ثُمَّ خَلَقْنَا ٱلنُّطْفَةَ عَلَقَةً فَخَلَقْنَا ٱلْعَلَقَةَ مُضْغَةً فَخَلَقْنَا ٱلْمُضْغَةَ عِظَٰمًا فَكَسَوْنَا ٱلْعِظَٰمَ لَحْمًا ثُمَّ أَنشَأْنَٰهُ خَلْقًا ءَاخَرَ ۚ فَتَبَارَكَ ٱللَّهُ أَحْسَنُ ٱلْخَٰلِقِينَ ﴿١٤﴾
Then We made the NUTFAH into a clinging clot, and We made the clot into a lump [of flesh], and We made [from] the lump, bones, and We covered the bones with flesh; then We developed him into another creation. So blessed is Allah , the best of creators.
Allah knows best