At least they didn't drag the "fake isekai" from his POV out too long if they've revealed his mother's trick already, so that gets points in my book. Ch1 awesome, Ch2 let down, Ch3 started like Ch2 then oh maybe continuing Ch1 in Ch4?
Now I understand why the manga spoils itself ever since chapter 1.
Look at the comments. Even with that many self spoiler and literal plot explanation uttered by the characters, people still got confused.
Probably the editor noticed this and tell the mangka to make the manga spoil itself and add tons of explanations. To handhold the readers.
++++++
1. The new planet is the same planet. Old and new planet is the same earth.
2. Mom deliberately lie to the son.
3. The son just orbits earth for years, then land on the exact same earth.
4. Now earth is populated with living beings that originally was created by mom.
The implication was there in the previous two chapters, it's not really a surprise to me.
The idea was never to send Noah elsewhere, but to have him sleep until Earth is inhabitable again. I think the magic organ is also his mom's invention.