This is just fear-mongering from Alex Jones Channel because everybody knows that Walmart shuts down their facilities when their employees attempt an uprising to unionize.

there are city mandates that require functional facilities. OSHA as well for workers specifically. it's a plausible excuse, did they look for plumbers trucks in the area?

I'd opine that there's no way they'd abruptly close down a Walmart merely to house children. There are plenty of empty warehouses and factory buildings all over the US which could be used for that purpose, and would be more suitable for covert operations since they're either isolated or in industrial areas. Walmarts have their own ecosystems around them where there'd be plenty of traffic to notice something hinky.

There's only one reason I can think of that would result in a Walmart being shut with no notice, religiously guarded, and even congresscritters turned away...

Contamination. NBC, could be any of those.