Sea Kite ??

The kite does appear to be trailing in a couple clips and this would certainly have an adverse effect. It is more probable the kite is being reeled in from a trailing position when the hull speed exceeds the available wind or the camera angle skews perspective. Here's a link to a long running thread on kite concepts...

https://www.yachtforums.com/threads/new-age-trawler-motorsailer-kite-assisted-poweryacht.8127/

So we use kites alot when targeting sailfish. They fly at 45° to each other and provide at good bait presentation. They will just fall out of the sky occasionally and are extremely difficult to retrieve without breaking. This is from a stationary boat. Can't imagine trying a kite retrieval from a moving freighter. Could get serious fast.

Hah! Wind powered ships…what will they think of next?!