This is overly exaggerated. Access to electricity is a must for a minority of people with medical need but it doesn't account for millions of people in Texas.
The key points for survival is access to non contaminated water, shelter and food. Lack of electricity is only an annoyance.
I rescued an elderly lady and her grandson who had no power for two weeks, the first week of which saw temps near 0F at night and below 25F during the day. No heat, nothing like parkas, no firewood for chimneys or firepits. I suppose the grandson could have figured something out. I'm sure the lady couldn't have. I don't know how many such households there were.
The key points for survival is access to non contaminated water, shelter and food. Lack of electricity is only an annoyance.