Is that because of the 100,000 residents? Fort Worth updated their ordinance in 2005 when SB734 went into effect. I'm not trying to be difficult. I really don't understand why something from '95 wasn't updated when a new law was passed in 2005.
I don't see where Houston would be excluded from SB734
"SB734" prohibits municipalities from adopting anti-shooting ordinances for properties that meet the acreage requirements. PC 42.12 is a state law, not a municipal ordinance, which applies to all cities with 100k or more people.
Also, those acreage limits only apply to land annexed after 1981 or extraterritorial jurisdictions. Any city can pass ordinances to ban shooting on all property inside the city limits as long as those limits were established before 9/1/81 (except shooting at sport shooting ranges).