Renewables had nothing to do with this and performed better than expected. A nuke plant tripped off and natural gas production and de-watering froze starving the plants. The vast majority of capacity loss was nat gas.
Natural gas follows all rollouts of renewables, though. In fact I'm not even sure you can separate the two. Grids with renewables would absolutely collapse without natural gas.
The only thing capable of replacing natural gas is batteries, which are extremely expensive and aren't exactly renewable, either.
Renewables may create demand for more natural gas on the grid, but you seem to be saying also that if Texas hadn't expanded renewables, they wouldn't have built so many natural gas plants. What would they have built instead to supply their power?
