It wasn't up to them, the nationalists have the signatures to force it on the ballot - I believe there are already lawsuits filed
You might be closer to this than me but far as I know the Texas GOP Chair declined the petition saying majority of signatures were invalid, and Texas Supreme Court denied the petition altogether. It’s a movement that will persist regardless of what happens right now, far too much popular support and too much fuckery from the Feds for it to quietly go away
Looks like the court rejected the petition since I heard news of it, so you're right and I was wrong https://www.dailymail.co.uk/news/article-12954689/Texas-independence-vote-court-ballot.html