I don't really have any research to back this up with 3DS games due to my only owning one game for that system that never leaves the slot in the back, However if the cartridges are anything like those from the previous DS systems then they should be fine. i carried my older games around in plastic boxes, with plenty of room for the contacts to slide around, and never had any problems. Also it seems that all the Amazon customers who reviewed the binder in question rated it with 5 stars. I would think if it was destroying games people would be complaining about the quality of the product.
I also have a small amount of experience in Electronics engineering from my vocational school. everything I know about electrostatic damage relates to IC chips. if the leads to these chips is touched without being grounded it can cause damage, however my experience is that once they are in the bread board that we use that they are safe to be touched.
So I theorize that the IC chips in the DS games are grounded to the circuit board on the inside, however I have never taken one apart before so I have no evidence. Follow my advice at your own risk. Maybe see what a few smarter people have to say first before considering my input.