What the author is saying is that much of what we call science are actually facts that we take on faith.
Middle school science are experiments we can all confirm, like observing protazoa under a microscope, or basic chemistry experiments.
College (and beyond) science delves into things that we have to trust others to perform on our behalf.
90% of western understanding of cosmology, anthropology, physics, molecular biology, etc all rely on us taking others’ observations on faith alone. And many are merely models or theories with no modern observation.
Moreover, the researchers who are making observations, are themselves using complicated apparatus designed by another person, like an electron microscope. The researchers are putting faith that the apparatus is producing an accurate & informative signal.
Your ability to observe and understand the world requires a lot of faith in that system.
Just remember that the entire system is built upon people, who have biases and are vulnerable to groupthink. There have been misunderstandings in the past, which are glamorously called “scientific revolutions”. Even small-scale misunderstandings should remind people to remain intellectually vigilant.