(You know I do understand what the author is saying, right? I'm just being pedantic...)Same as LNG. Put that way by lowered temps for easier transportation. Thaw it, gas again.
I think it is actually the increased pressure in the tanks which liquifies it. The coolness of the tanks and from when you release it is due to the energy absorbed due to the "evaporation" of the liquid to gas form.
(You know I do understand what the author is saying, right? I'm just being pedantic...)