Absolutely delusional.
You obviously haven't read anything in the original post of this thread, or the articles I directed you to in posts 45 - 55.
I have not said anything like you are asserting here. You are setting up straw men, then claiming these straw men are delusional.
I've never claimed "going down to 6 billion is a more likely scenario ... than hitting 8 billion." You are delusional to claim otherwise.
World population might reach 8 billion before it starts contracting. It might hit 9 billion. We're in uncharted waters, so no one knows for certain where the peak will be.
But following that peak, all demographic indications point to a rapid population contraction.
You are delusional if you believe otherwise.
And you are delusional if you think that rapid population contraction will not have dire economic, social and military implications.
If so then I would be worried about what was causing the population contraction - because it wasn't and isn't declining birth rates.
Birth rates are and have been sufficient to grow human population to 5 billion awhile ago, 6 billion for the last few years, and now around 7 billion.
Birth rates will be sufficient to grow human population to 8 billion and climbing.
That is a bigger problem than DECLING birth rates.