> "not putting carbon into the atmosphere" != "removing carbon from the atmosphere"

That’s not what they claim. Their claim is that the effect on global warming of creating X fewer contrails equals that of putting Y amount of CO2 less into the atmosphere (our main concern isn’t having so much CO2 in the atmosphere, it’s its effect on temperatures)

Unfortunately they also produce Z amount of extra CO2 and don’t know yet whether the effects of X compensate for Y and Z combined.