In Korpi’s Twitter thread, he explains that the supply is simply the selling pressure of miners and stakers receiving new ETH issues and consistently selling something, while the demand is simply the burned fee revenue, explaining that this is more difficult.
He assumes that miners are selling 80% and are not looking to accumulate crypto, but to generate profit from operating business, since the cost of mining is also high. On the other hand, stakers are probably only selling 10% and have no expenses to cover, all they want to do is accumulate Ethereum.
Korpi makes it clear that once the merger takes place, 10 million dollars of new coins will be needed every day to keep the price at the current level. Conversely, this could mean that the Ethereum price could rise sharply days or weeks after the “merge”.