"They want to have an oil spill. The cleanup effort costs millions of dollars and the contracts will be awarded to organisation which are in league with politicians and big business. That's how taxpayer money is pocketed by these villians. That's what happened in Mauritius."
The creator/poster of the video agrees. ("It does appear that this is the case.")
> is a floating storage and offloading vessel permanently moored offshore of Venezuela at the Corocoro oil field in the Gulf of Paria. After production at Corocoro ceased in 2019 following United States sanctions on Petroleos de Venezuela (PDVSA), Nabarima fell into a state of disrepair, and was reported in 2020 to be at risk of spilling her cargo of about 1.3 million barrels of crude oil.
> Following the Corocoro shutdown, Nabarima was abandoned with about 1.3 million barrels of crude aboard, and in July 2020 began listing to starboard, followed by a leak into her engine room the following month that failed bilge pumps were unable to pump out.
The YouTube video maker/poster seems to be jumping to conclusions, much as HN commenters did with the Kamchatka Eco-Disaster. 
tldr: The ship is in Venezuelan waters. Noone cares.
From the wikipedia page on the Mauritius incident, wasn't the cleanup paid for by the owners and their insurance? (as you'd expect)
Paying for clean-up is fairly murky, as most of the time it is high seas, and the laws are different. Also the company which runs or owns ship will usually will be asset light and just declare bankruptcy. Look at the case in Lebanon, many countries are not equipped to handle this kind of problem.
It may not be deliberate intent to sink the ship, but the systems we have in place does not provide a lot incentive for the operators to act fast or act at all.
But yeah -- it does indeed seem far-fetched.