What the author appears to be describing is the experience of being a PhD student/postdoc that he misses. As faculty you are (usually) no longer running experim

What the author appears to be describing is the experience of being a PhD student/postdoc that he misses. As faculty you are (usually) no longer running experiments and analyzing data, but managing people/projects, writing/reviewing papers, teaching, sitting on committees, and constantly applying for grants. While it is indeed unlikely he can find a faculty position after 7 years of being out of academia, he may in fact be happier looking for a senior scientist position at a university. As long as he is okay with the salary that is.