After seeing that GIF, I am 99% sure the animator thought up the design by themselves, probably to add some element of interest to the show, but without thinking about the practical side at all.
The animation shows the knife being used in a chopping motion, like a cleaver. But here is what a cleaver looks like
And this video can be used as a reference for proper use of a cleaver. We see slicing, chopping and rocking motions:
The knife in the anime is inferior to the cleaver shown above.
- It is more difficult to produce. Instead of producing a single continuous piece of steel, you have to punch a hole in it, without cutting through the side.
- A cleaver needs some weight. And much of its weight comes not from the thin blade, but from the back, which is thicker than on a Western knife. Making a cutout in that place is counterproductive.
- A cleaver profits from the lever effect. This is especially noticeable in other tools which are used with the same motion, such as axes. But it plays some role in knife cleavers, too. This effect is completely lost in the design shown here.
- A cleaver is held with the ulna and radius at relatively small angle to the handle, upper arm hanging in its natural position, the lower arm almost parallel to the table. This allows for smooth, precise movement. The design of this knife means that the upper arm is held parallel to the table, and the lower arm goes orthogonal to the table's plane, creating a very awkward position, which is probably also very tiring if you do lots of cutting. You can even see this terrible position in the GIF. This doesn't matter much in mezzalunas and other similar tools which are used with a rocking motion from the wrist, but this kind of chopping looks like a repetetive strain injury waiting to happen.
Considering these design problems, I hope nobody has had the idea of actually produce such a knife and use it in a real kitchen.