This guy links the bill and didn't read it. Here it is

https://capitol.texas.gov/BillLookup/Text.aspx?LegSess=86R&Bill=HJR148

Specifically, section 28 and subsections. It's every district and appeals court, not just the Supreme Court. And it's a complete power grab with terms, dates, to maximize complete control over the courts for as long as they can. Retention voting is only "as provided by the legislature".

The goal is to eek out 2020, gerrymander as much as they can to hold a few years, by then all appointments will be made, every major judge in TX will be Republican, and they'll all enter automatic 12 year terms where voters can vote on "retention or not" a few years after they're appointed and as provided by the gerrymandered legislature. There would be only two "votes" to retain, 2 general elections on even years after initial term (initial term is Jan 1 of first odd year after appointment, then they get an automatic 12 year term that's only dependent on those "retention votes"), and 4 general elections on even years after initial term. So, appoint in 2021, "initial term" ends Jan 1 2023, then first retention vote is 2026.

It's a complete play. People mostly overwhelmingly decide to retain judges, especially when there's no partisan distinction, even though they could be complete nutjobs. They'll also have half the decade to push through whatever they can with their partisan lackeys killing opposition in the courts.