Well, small production runs are sensible with 3D printing.

I suppose what you're noting is that the 3D model is not shared with you.

That web page doesn't mention the mechanism being protected by any current patents. Maybe there's no need. This is a mechanism resulting from substantial engineering work. It has significant tolerances, proportions, and curves. If you're not capable of creating it yourself, then it's also unlikely you'll reverse-engineer it just by looking at it.

Someone could laser-scan it. If using a visible-range laser, that person might have to take the mechanism apart first. Then I would hope that person would give due credit for any results, as well as consider what other legal and ethical barriers may inhibit reproducing this work.