Uh ... no. Obviously this author hasn’t spoken with any of my family.
Yes, I have “lost” some of my natural born Texan dialect ... mostly from working with folks from all parts of the world and other accents rubbing off on me ... but believe me, the “twang” is alive and well in the rest of my family.
I’m 66. When I was 13, I went to visit my Uncle in Odessa, for three weeks. Came back to Ohio with a Texas drawl! But I’ve always absorbed speech patterns, You should hear me do South Side Milwaukee talk! Ain’a?