I wonder how little time "immediate" means though. They probably have an overwhelming amount of incoming - from journalists, security service providers, and opportunist scammers posing as both of those groups among other things.
I assume they sent the email at least one minute prior to publishing the article when the sentence is phrased like that, it doesn’t really mean anything other than “We have asked them a question and have yet to receive any reply”. The waiting period could actually be a single minute and still be truthful.