I don't want to rain on anyone's parade, but you don't learn anything from this exercise. Unless you somehow know how many new customers would have signed up without a change in the price, you can't infer anything from this. It's tempting to compare with earlier growth rates (as the author did) but for a small, growing business the growth rate isn't going to be constant over time. What is really problematic, though, is trying to do this type of comparison when we're literally in a different world due to the pandemic.