I found that confusing at first too, but then I realized that 'they' is probably Matt's preferred pronoun. Which, while non-traditional, is a totally valid choice in 2021.
Likely correct. I know plenty of people who continue to use their traditionally gendered names while using neutral or opposite binary pronouns. Nonbinary experiences are highly variable. Longtime video game commentator Jim Sterling just did a whole video on their own experience with this.
https://www.youtube.com/watch?v=ZkAZhm5zdrY