Because people who enjoyed working with Elixir otherwise but don't want to participate or support that kind of environment have mostly left when the trend became clear. So the folks who are sticking around are the ones who are neutral-to-positive on AI. This means explicitly or implicitly surveying that group for opinions on AI's place in development work, such as while designing a conference schedule, are going to be missing most of those voices who might once have objected. It will continue to skew harder towards favoring AI in the future with most of the possible sources of more-critical opinions leaving.

That to me seems to match the definition of survivorship bias quite well?