Can your microbiome shift in only a week, after a dietary change?

No error range is reported so it's very hard to tell if those differences in one week are meaningful, much less accurate to 3+ significant digits.

To start with, what's the variation in microbiome from 10 samples taken throughout the same day, or even the same hour? If the variation after a week is in the same range as the variation after 5 minutes, then it isn't really significant, is it?