But the one on Ms Fuddy, as shown in post #239, for example, did clearly show upper and lower chambers, both being inflated. Those CO2 cartridges both would have been punctured.
Your pictures obviously show only one chamber.
Although that life jacket looks to have been made by the same company, the instruction markings are different. Also, the PFDs in this incident did not have the red inflation tube positioned as that one is.