Although I have no idea what you're talking about I do want to raise a question: what makes you think that some people worked on both Linux and FreeBSD? Those two usually exclude one another.
(edit): In the mean time I read up about the issue, why assume that FreeBSD users would know about this? I couldn't care less about Linux because I don't use it, thus I don't bother myself with following any news about it.
Anyway, something similar (not directly related) has happened with FreeBSD 13.0, and that got caught as well, so... I'm not worried. Look into netgate / wireguard to learn more.