I disagree with the conclusion. In the current environment, OpenAI can raise money as if were water pouring from a faucet. If SoftBank can't meet its agreements then there are 50 others waiting to take their place. In the current environment, OpenAI's revenue and capital requirements are not meaningful given their ability to raise.
The environment can change quickly, look at early year 2000 vs late year 2000 funding for .com for example - money went from on-faucet to you're-not-getting-a-dime in a few months. So if the funding environment for AI suddenly shifts, yes, OpenAI is cooked, but so is the entire AI industrial complex, from the smallest barely-billion-dollar startup all the way up to Nvidia.
My conclusion is that OpenAI is not a systemic risk, it's not going to fall or take down a large portion of the tech industry on its own, it will fall if investors sour on the entire AI industry for some reason.