The combination of the title and phrases like "simulations using a mid-latitude climate couldn’t get the job done because the rocks didn’t weather fast enough"

The combination of the title and phrases like "simulations using a mid-latitude climate couldn’t get the job done because the rocks didn’t weather fast enough" did make me think initially that they were proposing using this as geoengineering to pull CO2 out of the atmosphere. (But yes, that's not what they're saying. And my guess is it wouldn't be anywhere near worth it.)