No, we don't know all that. You are making assumptions about it.
Predictions made by "psychics" come "true" all the time. It is all based on vague prophecies that easily come true by simply looking for them to come true. Then fitting a given scenario to match. Not one prophecy made in the Bible predicts anything exactly in a way that could honestly be said to be an accurate prediction.
We have had people "predicting" various things that people in this world would eventually come up with, at least to a certain degree, just due to the ability of humans to draw reasonable conclusions given other evidence. I can predict that sometime in the future, we are likely to develop technology that will allow us to live in space or on the moon, provided that we don't experience some major near-extinction event that sets back the progress we are currently making. We will likely see maglev technology replacing certain other forms of transportation. Many others, with far more vision than myself could probably successfully predict things that humans will face further out with pretty good accuracy. And the more vague they are the more likely they are to eventually be right.
Within 4-6 years is a long time. That is enough time for major changes to any story to occur, especially someone who died.
I bet you can't recall as much about it as you think you can. You likely believe you do, but that doesn't mean you are right. For instance, I absolutely recall getting woken up by my roommate, and being told that something had happened (cannot recall the exact words he said). I quickly went into the living room to watch the news (it was about 6 am where I was), while he woke up our other roommate. Sometime after they were back in the living room, I remember saying "we need to get to base now". Now, I'm willing to bet that my description won't completely match what my roommates would say happened. It is also possible that any of us can see our memories changed to match pieces of the other person's.
Eyewitness memory - Wikipedia, the free encyclopedia
The "misinformation effect" is a real phenomenon that occurs when people start talking to others or hearing things others are or developing some sort of bias. They start to believe things that simply didn't happen. They end up with false memories of an event that they witnessed.
http://www.personal.kent.edu/~mzaragoz/publications/Zaragoza%20chapter%204%20Garry%20Hayne.pdf
4-6 years is more than enough time for this to happen, way more.