2:00 - 3:00 You talk about being consistent all the way to the tip , but when the edge is facing the camera on your circular strokes the front 1.5" of blade doesn't touch the stone...
3:20 - 4:10 , same deal , edge faces the camera and never once does the front portion (beyond the belly towards the tip) touch the stone.
4:30 - 5:10 , same deal still , your missing about 1/4 of your blade...
5:30 - 6:15 , still not getting the entire blade , your turning your wrist in to do the edge leading stroke towards you , hitting all the way to the tip , but going away from you your missing the entire front half of the blade by keeping your wrist fixed. Go back and look for yourself , its there.
6:45 - 8:45 , unless you are using diamond or ceramic rods , theres no such thing as a "sharpening steel" , a steel when properly used is only for realigning rolled edges. It is literally the only usefull quality they have. I would focus on removing burrs on your stones.
8:55 - 10:30 , Ughhhhhhh... An old leather belt does NOT make for a great strop , You can see how thick and soft it is , leaving lots of room for unintentional convexing , but theres also embedded contaminants to think about , if you wore that for a few years prior to hanging it in your closet to use for a strop , theres all kinds of embedded dirt, dust , salt , metal shavings and other yuckies that don't contribute anything usefull to stropping. Hanging strops are also a poor idea in general.
10:30 - 11:30 , knife stumbles on cutting test when it gets to the front portion , how surprising...
11:30 - fin , That diamond steel is going to gobble up that little peanut if you continue to use it like that , diamonds remove metal fast and that little peanut doesn't have a whole lot to lose. And when you went to the steel , you were almost holding the knife 90* to the steel at times , removing any edge you did have. The only reason the knife cut paper at all was because the geometry is so thin on a little knife like that , that any kind of apex that meets will whizz through paper.
Overview: Your technique needs work. I would start by slowing down , mounting your diamond plates to some blanks and using them like a waterstone , (ie not holding them in the air and banging the knife around on them). This is more precise , and will allow you to better control where the knife is contacting the plate , as currently your missing a full quarter of that blade on all three of the plates.
Your strop I would throw away... But if you insist on using it I would cut it up and mount it on a paint stick or something so it has a more rigid backing. After giving it a thorough cleaning and conditioning of course.
Throw the steel away , at the steep angles your putting on these knives they are never going to roll.
If your doing a good job at burr removal you should be able to clean shave armhair off the coarse stone.
This is all in addition to what Jason said.