UFO whistleblower David Grusch collaborates with Yes Theory on YouTube - The Washington Post

"So, this David Grusch guy is basing his entire claim on conversations that he had," not "actual evidence," said Avi Loeb, a theoretical astrophysicist at Harvard University, in a phone interview. Loeb says he watched half the documentary; he saw a narrative, not any actual disclosure. 

 "We need to look through telescopes and be collecting data through instruments, not through people talking about it on social media," said Loeb, who heads the Galileo Project, which searches for science-based evidence of extraterrestrial technological artifacts. "Somebody interviewing another guy who tells the story — who cares?"…

https://www.washingtonpost.com/style/of-interest/2023/10/05/ufo-david-grusch-uap-congress-yes-theory/