You really need to read what I wrote. I said that there is a third, much more important, source of CO2 for industrial applications like CO2 cartridges. That source is derived from fossil fuels.

There is a slight difference between volcanic CO2 and from biological CO2. While both "atmospheric", biologically derived CO2 is very short rotation on the order of hours to days to decades depending on the source (CO2 from microbes is hours while plant stored CO2 is either days or decades depending on the plant). Volcanic CO2 is very old CO2 like fossil fuel derived from the material that is tractored down into the mantel by the mechanism of continental drift. Thankfully, it's relatively slow process.

Further into the esoterica, volcanic CO2 is even chemically different from biologically derived CO2 in that it has no carbon 13 in it. Just like fossil fuel derived CO2, the volcanic CO2 is old enough that the C13 has decayed.

I find that very hard to believe for several reasons. First, you'd have to site the factory near a volcanic CO2 spring. That limits your factory sites. And the CO2 output from volcanic sources is relatively minor...on the order of 62 million to 300 million tons per year. Compare that with fossil fuel production of 29 billion tons per year. You'd do better trying to isolate it from atmospheric distillation.

Second, you'd have to have a process in place to scrub the CO2 of other gasses. Third you'd have to compress it and liquify it. That's a lot of capital investment for something that sells for around $1 each. Liquid CO2, refined and ready for use, goes for $13 a ton. That will fill a lot of cartridges for very little money.