I have never owned one such knife, but the video makes it look like an extremely dangerous closing mechanism.

You have to press a button below the cutting edge to close it? I sure hope it has a blocking mechanism that prevents the blade from closing fully until the finger has been completely removed. Like a timed spring or something, and even that sounds like a laughably bad idea.

Now, that is what I have gathered from the video only, it might very well just be a bad illustration of the mechanism.

No such mechanism. Sharp things are inherently dangerous - go slow, pay attention, and you’ll be fine.

Sure, but even dangerous tools can be made with some safety in mind. Do you REALLY need a shield for that circular saw? Not really, but those who use a shield risk having more fingers than those who don’t.

Personally, I prefer sheath blades, or a regular old dumb folding blades if absolutely necessary. Are they more safe than other blades? No they are not, but a simple, stupid design is better than one that has been specifically engineered to cut off as many fingers as possible (again, going purely from what the video shows, which looks about as safe to close as a butterfly knife).