I went and watched those videos...
Careful!
If the Cops see you throwing birds in one of those Whizbangs, they're liable to take you away in cuffs!
Also on the Whizbang What The Hey is with that?

Those chickens have MOST of their feathers off before they ever throw them in there!
O.k., I have a Duck Plucker, bought it back in the early 80's after I had to come back from a killer weekend of shooting limits of Mallards and Honkers.
I had some "mad money" that I was considering either buying a new shotgun OR a Plucker with.
After that long night of plucking there wasn't any "or" left over about it...it was a Plucker all the way.
The one I bought is called a Magna-American "Duck Stripper".
It's pretty much like that Duck Naked picker in the other video, except it's enclosed and has strong vacuum suction that deposits all the feathers and down into a large poly seed bag.
With it I can do a large Mallard and get it as smooth as a baby's a** in about 2 minutes.
The Plucker housing is too small to accept anything bigger than small Geese, but I've done Cacklers on it o.k.
The company that makes mine (was a Roto-Tiller company back in the south) went out of business probably 15 yr.s ago. But I have a couple of other friends who have the same model and we all love our's!
As some others have mentioned, there are "tricks" to making them work well, specifically they do not pluck WET (or bloody) feathers well. They also won't touch pinfeathers.
The wet feathers part, well you just have to take a blow dryer and dry out the feathers before you can pluck the bird well. When you realize this, you'll make an effort (given the option) to keep your birds dry(er).
Also, sometimes you can run the bird on the plucker and it will take out some of the feathers. The wet feathers then remaining are easier to blow dry or just allow to air dry, then once dry, the plucker plucks them fine.
On the real bloody feathers, well that's just around pellet holes for the most part, and you just pull those by hand.
If you're like me and you pluck your Ducks (I don't always), you start out strong, but by the 5th (or 13th) one you're starting to slow down pretty badly.
Plucking a limit in ~20 min. total using the plucker makes it a LOT easier.
BTW, while what I have is no longer made.
It wouldn't be too hard to fabricate (assuming you're "handy") something like this. It just uses a simple frame and an electric motor connected to a Forge Blower turned around backwards to suck the feathers from the housing and blow them into the bag.