As the author rightly points out many people who identify as atheists actually believe in all sorts of supernatural nonsense. The lure of superstition is very strong.
Full disclosure: I'm an atheist.
I was watching a YouTube clip of an interview with an English physicist. The interviewer is a science enthusiast who usually posts videos of a scientific nature. The multiverse came up as a topic and the physicist quite reasonably argued that it's a promising hypothesis in that it would provide an explanation for a lot of phenomenon that science can't currently explain. However, there is no physical evidence substantiating the theory and it's difficult to conceive how such a theory could be testable. Therefore, it isn't science and can't be considered "real."
This line of reasoning was not well received and the interviewer fell back on arguments usually heard from the mouths of creationists. "But you can't prove the multiverse DOESN'T exist." "Just because there is no physical evidence for the multiverse doesn't mean it's not real." That sort of thing. If you had replaced the "multiverse" with "god" you would easily think it was a creationist arguing with a scientist.
I'm worried that scientists are overselling string theory and untested or untestable hypotheses to the public. I re-watched the original Cosmos and there was very little speculation in it (outside of Sagan's confident comments regarding the probability we'd eventually find evidence of life on Mars' soil). It stands the test of time as opposed to the Neil deGrasse Tyson remake that prominently features yet-unproven speculation.