Nobody said anything about faith.
???????????
Who do you think made the laws the Universe operates by?
Believing that something exists without any objective proof requires faith.
Why should I believe that "primordial black holes" even exist if none have been observed? Even if all the "evidence" points to such things existing, we could say that there's a ton of evidence that Bigfoot exists as well, even though no one has seen Bigfoot.
This piece honestly reads like bad fiction. Perhaps these scientists should wait until they have observed something before they speculate as to whether or not it exists.