Not a bad vid, however I'd change the way it was done a little. Having done more of these than I care to remember being an ex Honda mechanic I'd like to point out a few things which may make things a little easier. Firstly there really isn't any need to remove the fork from the bike, you can just remove the allen key at the bottom of the fork slider and pull it off the stanction whilst that remains in the bike, there are a couple of drawbacks with this method as you still need to remove the fork top nut to fill it with oil afterwards and that can be a little tricky. I much prefer to remove the fork leg entirely from the bike without removing the handlebars, you can see in the vid the handlebars were banging against the tank and that can leave little dings in the tank which isn't what you want really, you can protect the tank of course but removing the leg without removing the bars is a lot safer IMO. Insert the leg in a vice, there was one in the vid used later so why not use it at the beginning, remove the allen key before touching anything else as you want the spring tension to keep the piston from moving with the allen key. Drain the oil and remove the slider, the seals circlip I wouldn't remove like that, easy for it to fly off somewhere and get lost even if it hits a wall it can still bounce somewhere and drop amongst all the bits of bike you have stored around if your like me. If your using good circlip pliers the tension it takes to compress the clip will allow you to just lift it out, if not try rotating the clip a little to break it free from the groove if it's stuck, use a finger on the top of it to make sure it doesn't flyoff anywhere when you slowly release pressure on the pliers. Why struggle holding the slider when removing the seal, use the vice, bottom end is nicely shaped for the vice and you can protect it from vice marks if your worried about them. I have a Snap-On seal remover which just pops the seal out very easily but a large screwdriver will work as in the vid, good idea in the vid to protect the levering edge from damage. When removing the spring look and see which way it's fitted, one end is more tightly coiled than the other, make sure you check orientation as it's easy to just pull it out drop it on the bench and forget afterwards which way it went.
Nice little tip using string on the cloth to remove it afterwards, like that, we just used to drop everything in a jizer bath but your idea has merit. When fitting the tophat on the piston rod make sure to keep it pointing upwards or it may fall off into the fork slider, slide the slider downwards onto the stanction and it has to stay in place, sometimes they fall off and you can struggle getting it lined up with the piston meaning you end up pulling everything apart again to shake it out.
Other than those points I can ony say well done for posting the vid, it helps a lot of members who can be a little intimidated by fork seals, once they see how easy they are to do in reality they are willing to try themselves.