Ok smartie way to pick on words. If you didn't find sources - you haven't looked hard enough. The fact is there's too much production and not enough storing space.
If not countries, some private companies or the transporters of oil may dispose of oil the "cheap way" and damage the ecology.
Just as I've predicted, the oil starts getting dumped in the ocean if the oil industry won't decrease production it may get much worse.
So, your source for this is an article that shows no evidence?
You should really start to think before digesting any rumor as you read it in the first piece of news your hear.
First, this huge oil pill has not been recorded by any other newspaper, no matter how hard you try the only one reporting is that website you mentioned while others talk about spills from 2019, 2018, 2017....
Second, that place is one of the last in which tankers would dump, the only tankers in that region are Russian tankers, with the ports having a capacity of 1mln barrels per day and with one of the last available storage facility to yet full. So, why would rosneft choose to dump its oil when they could simply store it?
Third, why is there only a case and not hundreds?
Use logic before taking any piece of news as solid truth.
Also, how is this a cheap way?
Load oil in a tanker, pay up the crew to ignore this, pay up the company that owns the tanker to ignore it, pay the port employees to ignore that cargo is not there, all to dump oil that can be seen from space? They could have simply dumped it in the oil pits waste lakes that every mining facility has and be done with it.