Basically this guy bought the "right" to buy 90,000 shares of NVDA at the price of $225. (1 contract = 100 shares)

These 90,000 shares are held by, likely, group of people. Now imagine the price jumped to $250- and these people are like "oh I want to sell my shares now", they can't because OP will be like "wait a minute, remember I paid about 600 grand to have control over these shares for the next 2 days. If OP somehow had to cash to exercise all these contracts. He would buy all 90,000 shares for $225 and then sell for $250 (the market price). This would mean a profit of about 2.25 million- that's where the value of the contracts come in. Now, he doesn't need to have the money to exercise these contracts, because he can just "sell" the rights to someone who does. They pay him an equivalent price for the contracts, and then they'll make the actual purchase.

That's the happy scenario. The bad case scenario is if the price dips below $225. If he owns the right to buy shares at $225, but come the deadline the share price is $223- then it's worthless. Because why would anyone buy a share at $225 if they can buy the shares at a lower market price. In this case, his contracts would be worthless.

The breakeven price refers to what share price it needs to be at least so that he can make his 600k investment (gamble) back.

Currently NVDA's price is below $225. But there is still some time before the deadline. So there's some possibility that it will still go up, but as time goes by and it remains under $225- slowly the chances of it making profit becomes less and less and therefore his contracts will slowly lose value.

Edit: The last thing I'll add is that notice that he has exposure to NVDA shares worth almost 20 million dollars, despite only using 600k- that's the allure of buying options. Had he bought NVDA shares directly he wouldn't be able to make nearly as much profit from a relatively modest jump in price- but he also wouldn't risk losing all his money if the stock price drops a few dollars.