The helmet would not bring him to this projection if it does not mean something. It must mean something and that is why he is here.
By now, he is sure that this is what happens on the day he came to this world.
He still had many memories of what had happened ears ago when he was in Earth Two.
It takes him a few seconds to uncover back his old memory.
Some of it is distorted a bit because of his attempt of trying to forget some of the memories but for most part his memory of Earth two remains intact
Of course, when he was at Earth two, he also tries to solve that mystery.
At that time, he is a very rich and influential man and as such one of the things he did was to investigate about the mass disappearance of people during the meteor shower.
One thing that he did get was that there was a surge of energy happening during the meteor shower striking on Earth
But he had never experience that surge of energy before.