There is nothing wrong with laypeople learning words. But if you use words that laypeople don't know, it's not a good laymen definition. You seem to be under the impression that laymen terms means it's outside the capability or expected behavior of layman to understand ever.
Fair, but we were not discussing providing definitions using laymen terms. We were discussing using words in reformulations of titles of articles posted on HN. I expect people on HN to be able to deal with a title containing an unfamiliar word and seek either a precise or a laymens terms definition when needed.
> Provide an alternative title for "Updated imaging and phylogenetic comparative methods reassess relative temporal lobe size in anthropoids and modern humans" so that layman people would understand.
Ironically, you ought to look up the definition: https://www.merriam-webster.com/dictionary/layman%27s%20term...