That document is about cable assemblies, where wires are put together into a single molded jacket, what you're doing is looming, where you combine multiple separate cables into a bundle that is held together by additional hardware. Don't spiral in both directions for bundles like this, especially with only five cables. That will make the loom stiffer and harder to coil and lumpy besides. If you want a spiral, just pick one direction and spiral them that way.
Cable looms are made all the time for live events, where cables of all different types are combined into bundles so they can be dropped onto truss and quickly plugged into equipment. Generally they're just laid straight and banded with tape (good quality vinyl or rubber electrical tape, usually) every couple of feet and they hold up fine for months-long tours getting coiled into and out of cases every couple days. If you're going to sleeve the bundle, you may not even need to band it, but it can help in the case that the sleeving is loose and would allow the cables to flop around inside.
Over-under vs half-twist is a hotly argued topic among people who coil and uncoil cables for a living. What you're doing in your video clip is a little hard to follow due to the number of times you turn the bundle around, but you don't want to do half-twist on both sides of the coil, that will be liable to turn into a whole lot of knots when you go to deploy it. Even regular over-under can have that problem if you're not careful when opening the coil, which is why a lot of people prefer half-twist. Either method of coiling really requires responding to what the cable wants to do--the whole point is to avoid twisting the cable as it's coiled, so a cable (assuming it's in good condition) will fight you if you try to coil it wrong. If you can find yourself a nice fabric-reinforced flexible rubber hose, like the kinds used for good quality air tool lines, that would be a great thing to practice with, as it's not too stiff against bending but very resistant to axial twist.
Edit to add:
If you do twist the cables around each other, it's important to ensure that each cable is not itself twisted. I don't really know how to explain this, but when twisting the cables around each other the ends sort of need to orbit around each other without rotating. Maybe look at videos of rope-making for the idea, the individual strands that go into a twisted rope are revolved around each other without themselves rotating (or sometimes with a slight counter-rotation so the spiral stays tight when the rope is allowed to go slack).
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