the article says the co2 is turned into ‘rock’. Doesn’t say if they’re releasing the o2 or capturing it.
This plant is just speeding up the natural rock cycle. CO2 when added to water forms carbonic acid which when injected into rocks that contain basic minerals with calcium,silicon,magnesium,iron,aluminum, phosphorus...ect. Will form carbonate minerals or silicates which are a solid new rock no longer a dissolved supercritical fluid. Those minerals are all typical of shales, clays, granite and basalts. The earth will do a similar process with dissolved CO2 in the oceans via the carbonate bicarbonate system eventually the atmospheric carbon dioxide will be turned into carbonate ooze and or limestone on the ocean floor above the CCD depths where carbonate dissolves into solution again. This is the same process that made the cliffs of Dover or the Bahamian carbonate banks that the Bahamas island sit on.
There is no question that humans have increased the CO2 content of the atmosphere every legitimate geoscientist accepts that as well documented with not only direct gauge readings from the 1800s onward but also 800,000 plus years of ice bubble data that has been isolated from the atmosphere under miles of solid ice. The question remains is the extra CO2 a bad thing. The earth has had drastically higher CO2 levels in the past due to a number of reasons volcanism and ocean degassing events being the largest. During those periods the planet was warmer and a lot more tropical. Greenland was green so was Antarctica. The temperate climate zones shifted north by thousands of miles and the whole planet greened. It wasn’t that long ago that the period now known as the Pleistocene Eocene thermal maximum was known as the Pleistocene Eocene thermal optimum. The temps didn’t change the wording did. Letting CO2 rose to 1000+ ppm will melt the Greenland ice sheet and a good portion of the Antarctica sheets as well it has happened multiple times in the past. Humanity will have to accept 25 meters of sea level change over a few millennia that would be unavoidable you can’t have it both ways higher CO2 , warmer greener planet which means more food but ice melts and sea level change over time due to that. Sea level will come up over a meter just do to thermal expansion of the earth returns to Pleistocene level CO2 and temps.