Nail removing gun - GIF

[Toolmaker51]

Apparently pneumatic, otherwise like a lock cylinder punch. Piercing through the wood, instead of prying from opposite side, after driving with hammer. Useless to some, others who reclaim material in volume, might find this helpful.
However;
I didn't see any reference to wood thickness, I expect the general use is on 2" lumber. Their site text is poorly drafted, repetitive, lacks effective proof-reading.

It's a perfect example what I call "long listing"; extolling obvious but questionable virtues.
Anyone of us could stick a nail-sized rod in a tube and whack with a hammer, accomplishing same effect, probably close to same rate per minute. It would also be more compact, portable, save lugging compressor, and save $50+ for a real tool...Compared to long-listing, those aren't imaginary benefits.
A more useful tool already exists, that drives individual nails, to clinch foot and head of close spaced cripples, near door frames, and frequently corners of stick frame construction.
It's a long tube, ID accepts head of 16d or 20d nails, a rod with a striking head...a simple design.

I'd find a small ID tube with a thick enough wall to notch a 'loading port' to save fully withdrawing the drive rod. Visualize a single shot bolt action rifle. An alternative would reinforce area around port with a close fitting sleeve.