In that video: the uniseals are a good idea, if you've never used them. I've never been able to source large amounts of cheap pot scrubbers. His use of PVC is pretty obtrusive, if one cares about aesthetics. He has the trash can elevated, so he's forced to make it a down-flow filter. Upflow has always worked out better for me, and that way the trash can can sit on the floor, so it's more discreet. Because it's a down-flow filter, he needs to make that spray bar thing, which complicates the piping.
But the worst problem, and the reason that filter will fail, is the fiberfill. It will clog, in some cases it will clog in less than a day. it will require constant maintenance, which won't get done, because it's such a tiresome hassle. And then it will turn into a toxic mess. Don't ask me how I know...
On the other hand, the baskets to contain the media are a good idea. I use mesh bags for this. I fill each bag with about a quart of lava rock. That way, when I need to clean the filter, I can just lift them out, rinse them off with pond water, and put them back in.
https://www.amazon.com/gp/product/B07YFJ6R8Z/
Best,
Bill