I think Hacker news removes "filler" words from headlines, which is why it is so weirdly phrased. The original headline is different.
People lazily remove words until it fits instead of reworking the whole thing sometimes.
Fair warning HN also automatically replaces submitted links with canonical links despite most canoncial links pointing to the original domain for SEO purposes. There is no warning or feedback for any of this, you're just expected to notice and edit your post after the fact.
Did lead limit extinct hominid and Neanderthal brain development and language?