he in fact acknowledges preservation of the Quran and the deliverance of the amanah by the various scribes, may Allah reward them all. his grouse is with the message itself but he can't find it in himself to confess to it, so he tries to throw in HIS interpolation into the Muslim deen See this from the same thread you cited:
you can see from the thread that you cited that this guy only works with european orientalist prejudices and conjecture that they try to pass off as "knowledge" - and the guy actually knows absolutely zero about Quranic sciences. these are his only "arguments" for making his kufr point
he is a kafir academic linguist who suffers from the european complex of being handicapped from acknowledging the superiority of Islam and Arabic, and tries to cast aspersion on deen itself. see this thread for instance "Is the Quran (perfectly) preserved?" is a question I get a lot. I'm never sure how to answer this, or why I am considered the person to ask. This is obviously a question of faith, not something that can be known as an absolute truth. Against better judgment, a small thread. pic.twitter.com/9Seo16rH5x— Marijn van Putten (@PhDniX) June 16, 2021 he also doesn't know anything about 3aqidah or history or seerah or hadith and so on. can't and doesn't progress beyond some simple, basic and elementary phonetics and lexicology, which he tries to make it sound profound, analytical, critical, sophisticated by using big words, but that is his way of covering up his ignorance and nonsensical philosophizing. he and his "research" can safely be chucked in the bin
He seems to be saying it was a later addition to the surah by rasulAllah ﷺ and not a later interpolation.
Has anyone seen what this person is claiming and can anyone comment on it? Sūrat Maryam (Q19) is well-known among scholars of the Quran for having a highly conspicuous passage (https://t.co/y4qok5xeHw) which must be an interpolation.The question however is: when was this section interpolated into the Quran? Manuscript evidence can give us some hints.🧵 pic.twitter.com/RiSy0eK1ze— Marijn van Putten (@PhDniX) October 29, 2021