It wasn't about profit for Roman at Chelsea, this is probably something similar,
The problem people seem to have is what they think INEOS is as opposed to what it actually is, INEOS is not a company with loads of shareholders, it has 3 and one of them owns more than 50% so whatever he says goes, though I suspect he doesn't work that way.
Regarding the debt, for tax purposes it's often advantageous to have such debt, that's why it's normal practice in business to take out loans to buy other companies, even if they do have the cash to buy anyway