>>692093
The point Jesus was making is in the context of the previous verses.
>Jesus answered, “Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God. That which is born of the flesh is flesh, and that which is born of the Spirit is spirit. Do not marvel that I said to you, ‘You must be born again.’ The wind blows where it wishes, and you hear its sound, but you do not know where it comes from or where it goes. So it is with everyone who is born of the Spirit.” John 3:5-8
No one has ascended into heaven by their own ingenuity or power, but only those who have been born again of the spirit. Elijah presumably was born again, and so he ascended.