Great article! SEM Rush's new ranking study of 600,000 search queries showed a positive correlation between direct traffic and top rankings. They indicated that Google prioritizes domains with authority and consequently more direct traffic when ranking websites in its search results. See their study here: https://www.semrush.com/ranking-factors/. So, direct traffic can be viewed as a positive ranking correlation.
This is the number of views that you can test each month on your website.It's up to you how you choose to use them, either by allocating all the views to one test or to multiple test, either on one page or on multiple pages. If you have selected the 10.000 tested views plan and you run an experiment on your category page which is viewed 7000 times per month, then at the end of the month 7000 is what you'll be counted as tested views quota.