It's good to know that you've seen this before.
I just find it odd that so often, there is such a specific number of nonexistent articles that then aren't available.
After I did a few other searches late last night on other random political topics, I couldn't exactly find a theme as to when articles weren't available. This morning.. now that I am more awake.. I thought of searching online for other conversations about this topic. Not much. A couple of conversations here for example, but not one really offers any answers: https://www.reddit.com/search?q=%22google+news%22+%22explore+in+depth%22
I guess my lame conclusion is that there must be some algorithm I don't understand.
The point of bringing it up is that I was hoping one to verify whether this happens. Get peoples input whether this disconnect was something they recall happening in the past. One would hope this might generate some conversation about the importance of media and information access.
Thank you also for answering with a sincere post in this Democratic Underground.