The vast majority of shares in fossil fuel companies are owned by rich people, rich people own the vast majority of assets and your mortgage/debt is their asset, pension funds own less than 0.2% of BP and Shell shares:
Review by Common Wealth reveals that UK pension funds hold tiny fraction of Shell and BP shares
www.theguardian.com
He wasn't just lucky with his timing as in oversimplified terms he was betting that interest rates would not go up due to the economy not recovering as long as the wrong policies were maintained, whereas the conventional wisdom at the time was that the government policies favoured by parties like the supposedly wonderful Conservatives would restore economic health and such a recovery was just around the corner (if you remember the Conservatives kept missing all their economic targets, including on deficit reduction). He became the #1 most profitable trader in his company globally whereas his colleagues either didn't do as well or lost money, so if it was just luck then they would have done as well or better. The point is he knew austerity politics was nonsense and wouldn't work, as well as creating ever more inequality in terms of wealth.
The point he actually makes in criticising the academics is that they don't have the real world experience that people like him and his colleagues have and they are not paid well by comparison so you are not going to get the best people in those positions because the academics' mistakes are not punished by a huge financial loss and potential instant dismissal.
You are misrepresenting his points, there are a number of factors to inflation (including COVID and Brexit) and energy supply is a big one but the effect of that is that rich will go into a bidding war for ever more scarce resources driving prices higher and that more money has ended up in the hands of the rich due to government policy of giving cash which flows to them resulting in ever inflating asset prices and the unwillingness to tax this back which exacerbates the problem. You reduce this excess demand to lower prices and tax money out of the economy.
He says that ordinary people will have to reduce consumption (they can't afford £2500 a year for the average family and the business support is only for 6 months, whereas the super rich could easily afford higher bills and Truss' plan has made it even easier and they will be rewarded through their shares in fossil fuels) rather than the super rich who consume the lion's share of our energy, this is the wrong way round and will result in ordinary people going cold (I don't understand why you don't realise this). Most business owners are not rich (at least not in the sense that we are talking about here).
There is less energy, just because we are paying more that doesn't mean there isn't less energy to go around. We will have to pay any increases in prices through taxation on ordinary people over time, that money then flows to rich people. How are ordinary people going to afford this? Why is the burden landing on us? I suppose you don't care if the rich keep bidding the price up, meaning we have to pay more, as long as this sham cap hides it in the short term. They will get ever fatter dividends in addition to having us pay for it, so that's brilliant then and it will not cost them a penny (the money flows in a circle back to them).
The alternative is a progressive tax based on usage, a wealth tax, as well as a windfall tax on the fossil fuel companies (with exceptions for disabled/ill people who need to run lifesaving equipment, hospitals, small businesses etc); this would reduce the energy used by the super rich (as I said, the lion's share) and would solve the problem at a stroke. You also transition to clean energy much faster using this extra revenue and insulate homes which means ordinary people would require less energy to heat them.