Here’s a review video - it’s actually a pencil, not a pen (since it doesn’t use ink, it just leaves a trail of particles from it’s tip). It doesn’t compare favorably with normal graphite pencils. It also will definitely not last forever - look at the tip after this guy has done a little bit of drawing, it’s visibly worn, and as it wears down it will get wider and wider.
The “AXL metal” is probably just lead, or an alloy of lead. If you’ve ever used a piece of lead to draw with, the result looks like this.
