I’m thinking it’s a regional thing and this guy is from my general region, it’s totally a thing out here. The letter “T” is really only useful on paper, people use “D” when they speak for the most part for “T” (except for T’s followed by an “h”), and “J” is any “D” when followed by an “r”. Side note, i found it jarring when I was younger and saw a Superman cartoon for the first time, and all the characters were pronouncing “Luthor” as “Luthor”, not “Luther”