I wonder. Elon Musk is not an idiot. Then why did he say that to go to Alpha Century you needed 40 years? Why does he participate to this world wide disinform

I wonder. Elon Musk is not an idiot. Then why did he say that to go to Alpha Century you needed 40 years? Why does he participate to this world wide disinformation? Since 1904, we know that to go to Alpha Century, if you can accelerate to a non negligeable fraction of the speed of light, then you need a time that below the distance, and non negligeably close to zero. In clear terms, to go to a star that is 4 light years away, with a 1 g constant accelleration, you need to travel for about 2 years. If you put in space a nuclear reactor (that can produce energy for more than ten years), and if you can use that energy to produce constantly a 1g accelleration, then you can easily go to Alpha Century, in 2 years, spend 2 years there, and come back in 2 years, for a total travel of 6 years. Now tell me we can't with the current technology build a space ship that can work safely for 6 years! Of course, when you come back to Earth, 82 years will have passed on Earth. I hope you put your saving in a good investment fund. Anyways, I'm wondering why Elon Musk, amongst all others, is propagating this lie? It looks like quite a confirmation for a complot theorist...