OK so the article says you can go on Google Maps walkabout on this island, so I did. Here's a particularly trashy part of it:
https://www.google.com/maps/place/He...4d-128.3271112
I walked a good half mile. Nasty area
Very consistently, amongst the trash, are two things: pink basketballs, some covered in netting; and, wadded up section of green netting and rope.
It's not all plastic. There are a lot of wooden planks.
In this area, there is a large flight-ready trunk and full-size suitcase in good condition; I'll bet that's where the Google team started from.
https://www.google.com/maps/place/He...4d-128.3271112