Who in their right minds realistically expects any organisation to respond to some random journalistic enquiry on a Sunday?
The other major variant of this shyster tactic is along the lines of, "Company X failed to respond immediately when asked for comment." No company is able to respond immediately, particularly not on an issue that's likely contentious. Any response would need to be run by their PR and legal people at the very least.
It's a cheap and nasty way to make companies look/feel uncaring about the issue being reported, but imho it does nothing but reflect poorly on the reporter and publication using these smelly tactics, and leaves me wondering what other agendas they may have running.