I think it reads "users" page and parse it's content, counts number of users in first page and number of pages. the rest is a simple Multiplication.
probably same happens for reading number of questions.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.