Superbly researched and presented. As you clearly have a penchant for deep dive research, I leave you this link, which I have no time (I'm painting a house tomorrow) to follow up.
https://medium.com/@TheHimmmm/nasty-business-a-himmmm-blind-item-story-6fc0c8147f5a
The oligarch may be Roman Abramovich? Dunno.
Thanks!
Edit: Here's this too. Note the name of the fund.
Nice! Actually Abramovich is another individual who has an island in the Caribbean - probably the only one I haven't looked into yet. So thank you for this information, maybe there's something here!