An interesting video. So others have given blow by blow refutations of these kinds of points before. As you say, you can find these on the Internet too. For me it is enough to know that alongside the bits and pieces that were written down on pieces of parchment, stones, and palm leaf stalks there has always been a long and strong oral tradition whereby the Holy Qur'an was committed to memory and transmitted from several such memorisers and reciters of the Holy Qur'an to others and so on from the time of the Holy Prophet (pbuh) until the time it was all committed to writing in one standardised form and beyond. As regards the variants in the Qur'an manuscripts, the differences do not amount to very much in terms of their meaning.