Yes, the tone is a bit hyperventilatory and the author is not especially authoritative (on this subject), but the argument is really quite convincing.

The climate movement has been so focused on reducing emissions for so long, it’s lost all sight of the fact that there are other ways to bring carbon dioxide concentrations under control. […]

Marine Carbon Dioxide Removal was always something we were going to have to do. In the new Trump era of not even pretending to try to curb emissions, the urgency to act is all the greater.

And, right now, seaweed might be our best hope.