This is the kind of thing she was saying:
Multiverse research concerns itself with postulating the existence of entities that are unobservable in principle. This isn’t scientific and should have no place in physics. The origin of the problem seems to be that many physicists are Platonists – they believe that their math is real, rather than just a description of reality. But Platonism is a philosophy and shouldn’t be mistaken for science.
What about Avi Loeb’s claim that the interstellar object `Oumuamua was alien technology? Loeb has justified his speculation by pointing towards scientists who ponder multiverses and extra dimensions. He seems to think his argument is similar. But Loeb’s argument isn’t degenerative science. It’s just bad science. He jumped to conclusions from incomplete data. It isn’t hard to guess that many physicists will object to my assessments. That is fine – my intention here is not so much to argue this particular assessment is correct, but that this assessment must be done regularly, in collaboration between physicists and philosophers.
Yes, Imagination and creativity are the heart of science. They are also the heart of science fiction. And we shouldn’t conflate science with fiction.Sabine Hossenfelder, “Can Physics Be Too Speculative?” at BackRe(Action) (July 24, 2021)
We love it. But we can sure see why a comfy establishment wouldn’t want it.
See also: NASA seeks standards for ET life claims Guidelines are certain to be disputed but they would at least provide a basis for reasonable discussion. That might lead to more and better public education on the issues.