https://archive.md/VQNcJ (sadly this isn't the updated version with the 18 wellbeing experts line)
But basically it's about Zuckerberg testimony and evidence in an ongoing court case in California. I believe case 23SMCV03371 but there's a number of coordinated cases. [0]
From reading other articles[1][2][3][4] about the testimony I think "18 wellbeing experts" is referring to external consultation funded by Meta/Instagram that appears to have overwhelmingly turned up concerns about the impact beauty filters could have on young girls (who weren't even supposed to be on the platform in the first place).
There's some stuff with internal Meta employees also raising concerns. I didn't see anything about internal Meta employees saying it was ok but of course it's hard to know without free access to actual court transcripts and exhibits.
Zuckerberg himself said they decided to allow the filters but not recommend them and that not allowing the filters would have been paternalistic.
[0] https://www.lacourt.ca.gov/pages/lp/access-a-case/tp/find-ca...
[1] https://www.wunc.org/2026-02-18/zuckerberg-grilled-about-met...
[2] https://www.wired.com/story/mark-zuckerberg-testifies-social...
[3] https://www.kten.com/news/business/takeaways-mark-zuckerberg...
[4] https://www.wandtv.com/news/national/zuckerberg-testifies-at...