I see the article says he's charged with unlawful carrying of a weapon. I assume this to be a violation of 46.02 rather than 46.035, unlawful carrying of handgun by license holder.
So the often mentioned "intentionally" failed to conceal is under 46.035.
Under 46.02 you basically can not be in possession of a firearm anywhere but you home, car, or place of business. As CHL holders we are exempt from this due to 46.015 Nonapplicability. Specifically
(b) Section 46.02 does not apply to a person who:
(6) is carrying a concealed handgun and a valid license issued under Subchapter H, Chapter 411, Government Code, to carry a concealed handgun of the same category as the handgun the person is carrying;
So the argument goes that the Nonapplicability afforded under 46.015 does not apply to the person carrying an unconcealed handgun, whether it was intentional or not.
I'm not saying I agree, or that it will stand up in court, but it definitely earned this man a ride.