What exactly are the 'Dots & Vowels' Shabir's protecting?

Arabic is quite different than English, so not many people understand what Shabir Ally is saying when he refers to the different 'readings' of the old Arabic Qur'ans, due to the diacritical variants in the archaic Arabic Qur'ans. So, when he says that there isn't anything to worry about concerning these many variant readings (we have now found 93,000 by now), because, he says, they don't change much, and certainly don't change the meanings of the verse when it comes to belief and practice...most of us hearing that accept that he knows what he is talking about, and therefore, there's not any story here. To prove Shabir wrong, Jay, in this video, takes a 10 minute segment which he recorded in September of 2019 from a talk he did at Kensington Temple (KT) in London, where he explained just how these diacritical marks (i.e. dots and vowels) not only change the words and the text, but they change the meaning of the text, and at times even change the theology of the verses. Shabir should be worried by these tens of thousands of different readings, and shouldn't so easily slough it off by simply saying there are no doctrines or beliefs which are changed in these thousands of variants. The fact that even one word in changed, or that whole sentences take on different meanings proves that the Qur'an is indeed a man-made book, and is not something which resides eternally in heaven, nor was unfettered by human hands. These thousands of variants prove that this book is no different than any other book written by men, altered, accreted, deleted and corrupted over the 1400 years it has existed. © Pfander Centre for Apologetics - US, 2020 (28,350) (Music: "small adventure", by Rafael Krux (from filmmusic-io - License CC BY)