From reading the article, it appears that the stuff only works at about the freezing point of water, which presumably means that the moment it heats up, it starts giving off the trapped methane. Unless they can figure out a way to get it working at warmer temps, I can’t see it being useful outside of places like Alaska.
I think the idea is that you use a refrigerator to powder it and then transport the powder in something insulated/refrigerated. Heck, if a powdered molecule is significantly smaller, you could possibly put a full semi-trailer’s worth of gaseous methane in an ice chest in the back of an ice cream truck. Given that they say that a single grain soaks up a “large quantity” of gas, this sounds like it might be possible.