The link you posted cites and links the FDA meeting they had for public discussion. It was almost a 9 hour meeting (which they have a youtube recording of), to say that wasn't transparent seems... inaccurate. Did you not read through the citations from your own source?

>Interested persons may present data, information, or views, orally or in writing, on issues pending before the committee.

https://www.fda.gov/advisory-committees/advisory-committee-c...