If you knew and did not so note, then the post amounts to a fabrication because you posted it as something current to be concerned about now.
It may be that it is something about which we should be reminded so that we don't go to sleep.
But the fact remains that you posted it as news, not as history, and that makes it a fabrication.
In short, it makes you look foolish.
You owe it to the rest of us to be specific.
You also owe an apology and a smart remark that you print all of the news that is fit to print when in fact that was not news is a further insult to all of us.
I was in a hurry last night and copied the article to two sites without researching. When I learned of the facts, I immediately apologized to everyone who read that information.
You should do the same.
If you got suckered by an email that was not accurate, a quick apology would make a lot of difference to your readers.
Not any more foolish than you who continues to beat a dead horse!