Marion Island is just like Macquarie Island - a research base where the only amateur radio activities will be from a scientific expeditioner who is a ham.
I was fortunate to work Pierre ZS8M in 2012 on 20 m SSB. Then David was there in 2013. I see in my log that I worked David on 22 May 2013 on 17, 15, 12 and 10 m SSB, all in the space of a half hour!
Have a look at the history of David's over-wintering there with the scientific expedition. They had problems with a generator, the supply vessel had difficulty getting there, and things looked dire there for quite a few weeks, as in running out of fuel and food. It was a really serious situation.
I haven't heard anything about Marion Island, or any plans for a ham to get there since.