I have wondered, too. Here's what some msm wrote about it. Personally, it sounds like a goodhearted thing

Walmart announced most of its stores will offer "sensory-friendly shopping hours" every Saturday from 8 a.m. to 10 a.m through August.

In a Back-to-School press release, the retail company said it will dim its lights to better serve sensory-sensitive shoppers. During the two-hour period, most stores will turn off their radios and display static images on TV sets.

The accommodations are meant to improve shopping experience for autistic people, those with sensory processing discover and other sensory differences, the release said.

"We are striving every day to create a culture where everyone feels they belong," the company stated. "This year, Walmart is taking steps toward creating a quieter shopping environment that’s more enjoyable for customers who live with sensory disabilities."