Helix – lube or no lube?

Received my Aneros Helix yesterday in the mail. Booklet doesn’t say to use lube to get it in, but does for different to on opposing page.

Do i use lube to get it in or just relax and get it in there? I’d have thought you’d use lube, but it’s not stated – and why not if it’s a no?

Question feels stupid but it’s explicitly stated to use lube for the other toy in the same booklet, no unsure now!