Celebrating an Apocalyptic Plague
The video you linked contains no new information whatever, despite the sensationalized title. What the information it twists actually testifies to is an honest inquiry into the nature and practice of the Christian faith, as it was commonly understood at the time, in comparison to what the Holy Scriptures plainly taught. That Luther remained convinced to the end of his life that the Christian Church existed before him, continued to exist, and always would exist, Matthew 16:18, is wholly unsurprising. It is entirely scriptural. That Luther for a good while hoped that the Roman pontiff of the time was not part of the evident corruption in and by the Roman church of the time is a testament more to his basic loyalty and conservatism. When his pleas for serious examination of such abuses went not simply unanswered but denied - and the abuses defended! - that signaled the turning point. And that point was made by Rome. Luther was excommunicated by papal decree. He did not leave the church. Luther also continued to believe that the Roman church still included many Christians, because the Scriptures were still read there and the liturgy still retained many of the scriptural truths within it, although with admixture, and also, from time to time, they were rightly expounded by preachers, i.e. priests, who were more faithful to the teachings of Christ. Some of whom are still around today.
The video also likes to cherry-pick certain statements of Luther from his early writings to “prove” its narrow point, that is, that “Protestantism” (an originally papist pejorative term, that many of the later advocates of radical reformation and their followers - think Karlstadt, Zwingli, and Calvin - uncritically accepted and actual Lutherans reject), and then use that narrow point to issue a blanket denunciation of everything Luther wrote and preached. Such an approach is not intellectually honest. The video is, in fact, propagandistic, if not a piece of outright disinformation.
In other words, to make this brief, the video you linked is analogous to a Marxist analysis of capitalism, amusing in a certain clever way, but in the end useless.
Martin Luther: Topical Master Index For Papers And Blogs