The scholars have different opinions regarding what the Huroof Muqattat mean. There is nothing from Allah SWT or Prophet Muhammad [pbuh] that clearly and openly explain what these letters mean, so what we are left with is different opinions, which may be correct or may not. What we know without doubt is that these letters are from Allah SWT and we accept them as part of the Quran and their full meaning is with Him
Regarding your video, this has nothing to do with Islam, this is from the Submitters who follow Rashad Khalifa. As Muslims we already believe that the Quran is a miracle, we dont need a computer to “prove” that for us. When RS first came out with his “theory”, Muslims embraced it excitedly. But holes came up very quickly and proved the reality of what RS really was. He used his theory to claim that he had discovered the exact date of the Day of Judgement, this he said when we know from authentic hadith and also from the Quran, that none has knowledge of the Hour except Allah SWT. Even when Prophet Muhammad [pbuh] was asked by Jibreel in the famous Hadith Jibreel about the Hour, he replied that he didnt know. And Allah Himself says in the Quran that none knows this except Him. And yet RS amazingly discovered this himself??!! And then after he stated this, then the Muslims started moving away from him and his works. And then he went he even further, as other scientists starting looking more deeply into his theory and finding holes in them, RS said that he has discovered through his theory that the Quran has two verses that donot match his mathematical formula of 19, so he rejected them and said they are not from Allah! And when he printed his own version of the Quran, he actually removed those two verses from his book. So instead of admitting his mistake, he was delusion enough to believe that it was not his mistake but a mistake of the Quran!! And then later RS came back to reject all hadith and made his own cult of Submitters who take only Quran, and this cult still exists today and their religion is very different than Islam. Even their salah is so different than ours. And some even say that RS later went on to claim that he himself was a prophet. So its clear that he was very messed up so please be careful about spreading his nonsense work!!!