No, they did not get answered by Slat in the comments. Are we reading the same article?
Dr. Kim Martini is a very respected oceanographer. While you may not like the tone of the article, she knows what she is talking about. Her concerns were not answered, she just thanked him for replying. Here's a later followup article, so it is clear these concerns have not been resolved.
Every time this project comes up and actual scientists point out the issues, even people who generally trust scientists seem to be very hostile to criticism of the project.
Dr. Kim Martini is a very respected oceanographer. While you may not like the tone of the article, she knows what she is talking about. Her concerns were not answered, she just thanked him for replying. Here's a later followup article, so it is clear these concerns have not been resolved.
http://www.deepseanews.com/2017/01/what-did-the-boyan-slat-a...
Every time this project comes up and actual scientists point out the issues, even people who generally trust scientists seem to be very hostile to criticism of the project.