That was an interesting article. I was hoping to see other information, perhaps any data on possible degradation of syngas in storage over time, particularly at higher compression There is at least one video of a fellow who stored compressed syngas over a winter, seemed ok.
It seems the gasifier they were using was producing tar, and the compressor tank was serving as a condenser. I wonder who got that compressor after their experiment.
As Koen mentioned, it seems that syngas is a poor candidate for compression, it resists compression linearly, not like propane, ammonia or butane. Which is why those will serve very well in refrigeration. The energy costs of compression will at least represent a significant portion of the syngas energy.
It could make sense for specific applications, but extravagant ones, as the efficiency will be very low. As pointed out, a stick of wood or lump of charcoal is already high energy density fuel with no work required.
If a person had a charcoal retort system, there is the potential to produce syngas without nitrogen dilution. The offgassing of volatiles and hydrocarbons will be above the heating requirements to make the charcoal.
Syngas storage was commonly employed in the “gasometers” in town gas systems. Mostly to efficiently meet peak demand, and to serve as mains pressure regulation. If a person had a small generator, or perhaps a hot water tank, perhaps a summer kitchen cooktop (any of these outside, well ventilated, as nobody wants to die from CO poisoning), then a volume of gas on tap at 3 psi or so might be very handy.