I literally know them in person. It's a guy. They have a signal and an email right there, you can message them and talk it's not that deep
Besides, he's got a point. The initial PoC that kept popping up on Mastodon (the ones he linked in the post as well) simply didn't work. One of them even posted an updated exploit later that still didn't work, but supposedly meant the vulnerability went from CVSS 10 to CVSS 4.