“As explained elsewhere, their understanding of the inflation was drastically overstated, because they expected to find young universes, and what they found was universes looking like our universe and all the others they found,”
We have never found another universe. Our best understanding is our universe is infinite.
Although parallel universes do exist, even secular scientists admit there is a good possibility. I wrote about it once. Yet no telescope is going to ever detect them.
Here is a good article I wrote about parallel universes which even secular scientists admit possibly exists, Is There A Parallel Spiritual World?.