"The research stated that if microorganisms consumed the sucrose stored by the roots of the seagrass, at least 1.54 million tons of carbon dioxide would be released into the atmosphere, which is equivalent to the carbon emissions from by 330,000 cars in one year."

Those number strongly suggest no. "A million tons" and "hundreds of thousands" may sound large but in this context they're tiny. And if we did try to farm these we'd have to displace other ecosystems for the farm land (under ocean).