Following through to the actual TX SC decision, as best I can through the links, the ruling doesn't do what the article suggests.
This is the ruling, right? It's a clarification on Canon 4 related to activity outside of the judge's actual job, effectively related to the judge speaking in public.
So it wouldn't sanction discrimination against same-sex couples because it would operate outside authority.
If anyone has a different link, please share. I wish such articles would link to what they were talking about.