Ikhtilaf and kufr

It is narrated in al-Fasl fi’l-Milal wa’l-Ahwa’ wa’l-Nihal, 3/128: >Ibn Hazm said: We narrated from ‘Umar ibn al-Khattaab (me Allah be pleased with him), Mu’aadh ibn Jabal, Ibn Mas’ood and a number of the Sahaabah (may Allah be pleased with them), and from Ibn al-Mubaarak, Ahmad ibn Hanbal, Ishaaq ibn Raahawayh (may Allah have mercy on them), and from 17 of the Sahaabah in total (may Allah be pleased with them) that the one who deliberately and consciously does not offer an obligatory prayer until the time for it ends is a kaafir and an apostate. This is also the view of ‘Abd-Allah ibn al-Maajishoon, the companion of Maalik. And it was the view of ‘Abd al-Malik ibn Habeeb al-Andalusi and others. It is narrated in al-Muhalla (2/15): >He (may Allah have mercy on him) said: And it was narrated from ‘Umar, ‘Abd al-Rahmaan ibn ‘Awf, Mu’aadh ibn Jabal, Abu Hurayrah and others among the Sahaabah (may Allah be pleased with them) that the one who deliberately does not offer one obligatory prayer until the time for it ends is a kaafir and an apostate. For those who are of the view that it is not kufr to leave the salah, how do you respond to the following narrations by Ibn Hazm? From the 2nd narration especially, it feels extremely clear that the one who misses even 1 prayer, is deemed a kafir. After all, the narration is very specific, however, I have pulled the following sources from this site: https://islamqa.info/en/answers/52923/is-the-person-who-prays-friday-prayer-only-not-a-kaafir , so I don't know how trustworthy this text even is. Likewise, In matters of ikhtilaf, for example, if one follows the majority opinion that leaving the salah is not kufr, and is convinced by this, and he leaves the salah and is convinced that he's Muslim due to his following of that valid opinion, in the eyes of Allah, is he still deemed a kafir, or is he excused in this matter because had he known it was kufr, he would not leave the salah?