It's unfortunately fake news, if you read the Reuters report they cite as evidence there is no mention of exclusivity just funding. In fact the exact opposite is said.

> The U.S. government has spoken with many (more than 25) companies that claim they can help with a vaccine. Most of these companies already received seed funding from U.S. investors... any solution found would be shared with the world

https://www.reuters.com/article/us-health-coronavirus-german...