It looks like The Brownstone Institute (formed in May, 2021) is led by Jeffrey Tucker, who has his clearly stated agenda. On their home page:
The motive force of the Brownstone Institute is the global crisis created by policy responses to the Covid-19 pandemic of 2020. That trauma revealed a fundamental misunderstanding alive in all countries around the world today, a willingness on the part of the public and officials to forego freedom and fundamental human rights in the name of a public health crisis. The consequences were devastating and will live in infamy.
In their mission statement:
The world needs the Brownstone Institute now to prevent the next “snap” lockdown and make the case for an open and free society. The idea is to correct and compete with the mainstream media and take on the technocratic disease managers, or anyone else who believes rights and liberties can be violated, at the discretion of political leaders, to central plans.
The article in your link tries to make something out of the resignations of Marion Gruber and Phillip Kause. He has no idea why, yet he speculates on it. That is not fact; that's supposition. He speculates they resigned to stay ahead of a firestorm from this legitimate article, which they co-authored, along with several others:
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(21)02046-8/fulltext
Here's an opinion of Jeffrey Tucker and his Brownstone Institute. I don't know if Angry Bear is legit:
https://angrybearblog.com/2021/09/does-the-brownstone-institute-produce-reasoned-arguments-or-propaganda-we-report-you-decide
Today the FDA only recommended boosters for those 65 and over or those at risk for severe Covid. Seems a measured approach, no?:
https://www.nytimes.com/live/2021/09/17/world/covid-delta-variant-vaccine