I looked for the video but didn't find it. The method I described just makes setting up the guides a little easier. The horizontal position of the guides isn't super critical. I think mine is deflected about an 1/8" but what is critical is the back bearings that rides on the back of the blade. Ideally they should not touch the blade until the saw is cutting. Again, this is ideal and there can be some pressure but not very much. On my saw Harbor Freight had the blade deflected over 1/4" downward. They did this to make the saw complete the cut instead of fixing it right. When I set the blade up close to being correct I encountered other problem. The head would not drop far enough to complete a cut. John Vreede is very good on these saw. He might explain this concept differently but I'm fairly sure he will agree that less blade deflection is always best. Hopefully your saw is not like mine. I sell a plate to correct this problem. I have one left but don't plan on making more unless there is a significant interest. Let me know if you need it and I'll send you a link,?
Mark