Bet it’s a crap knife. Air cartridge guarantees it’s not full tang.

And once you’ve stabbed someone, they generally stop fighting (if not, you are using the wrong damn weapon). Blasting the wound with air to crank up the damage probably changes the situation from you performing self defense to you committing attempted murder.

In other words, this “weapon” is marketed to gullible wannabe tough guys. Your typical hoplophiliac who is such a wuss that they need to open carry at least two guns just to feel safe at Chili’s.