For starters, it’s due to management distaste for the things. Given how funding for us research has been handled this year, that is sufficient to end consideration for that approach. If not for vaccines in general.

Paywalled

that site is a place for companies and gov to post press releases. almost every other site will reprint with slightly different title.

e.g. https://www.fiercebiotech.com/biotech/nih-director-says-publ...

just search for the title and read any of the 200 results.