Here’s what I’ve read on this that contradicts this article. The 14th amendment deals solely and absolutely with the child. Not the parents. Arguments about the parents are irrelevant because there is nothing about the parents in the 14th amendment. A child born to diplomats in the US has at birth a diplomatic passport, falling under the 14th. At the time of passage, native Americans were citizens of their tribe and fell under the 14th.
There’s no similar circumstances that apply to the children of illegal immigrants at birth. We all understand that won’t matter in the end. In all likelihood the SCOTUS will make something up or find something in an obscure 19th century text that they will rely on as absolute precedent.