Earlier quoted context omitted.
His students you mean, otherwise he would be first author. Academia is just like capitalism, with credits substituting for capital. The capital owner (laboratory head/professor) always gets a cut of everything published.
Authorship conventions vary a lot within the academia. In general, the closer the name is to either end of the author list, the more significant their contributions likely were. Things also vary from paper to paper. Sometimes the first author just did the actual work for somebody else, and sometimes they also made significant intellectual contributions. (If the first author is listed as the sole corresponding author,…
I know senior authors who are last on a paper just because they're senior and realize they (1) didn't really contribute much at all (they might have just inserted themselves on a paper), and (2) invoke the old meaning of last author knowing that the meaning has changed, so they end up being "the senior author" who gets a lot of credit just because they're senior.
Even producing the data takes on new meaning in an age of open science where datasets are distributed freely. What's the difference between citing an original study paper to give credit to the study PIs, and having them as a last author? Should someone who generates a dataset be last author on every paper using that data?
Sigh. Academics is so broken.