This was confusing me also.
But the kit I have seen on youtube reviews had two tubes (strange being a telescope) a small one for the 18350s and a larger tube for the 18650 and 18500. So I would guess it only has the large tube in it, which would fit all size batteries. I dont know really, I am contemplating ordering it myself.
Or maybe its just really badly worded in the info.
edit: just looked at the busardo review again, the small tube works with all sizes as well, so i suppose it doesnt matter either way.