[bamboozled]

Every time you drive a car or get in an airplane you're in the "When you don't know exactly how things will be affected" category, you're adding more Co2 to the atmosphere and thus warming the planet at a never seen before rate. We don't know exactly how things will be affected.

...but trying to reverse some of this is bad now?

From reading the article, it seems hard to say the experiment sounded negative?

[aporetics]

Read Elizabeth Kolbert’s “Under A White Sky” for a history of how best-intentioned interventions into ecologies have consistently backfired, in each case the unpredictable and far reaching complexity of the system was thrown out of balance.

I think the commenter’s admonition may have been expressing the the same lesson: its hubristic to “fix” systems with hacks like this; whereas carbon drawdown is not a hack, because it operates within the mechanism of imbalance itself.

For my part, this article had so little reporting of the complexity of ocean ecosystems and the potential dangers, not to mention how it buried the bit about how carbon intensive lye is (the same reason that makes concrete have such a huge carbon footprint) that it read like a puff piece.