We base the list off of a few metrics, namely the average players playing and the max number of consecutive players. We look at this across a week (rather than just a single day, as many of our players only play weekends or only play during weekdays). We never stated that all servers on our list are ones that are completely dead and have zero players but generally speaking there are quite a few that are completely dead with maybe a single person playing for the entire week duration.
I'd be happy to look into your server though and see if there is indeed a mistake in the list, but the current list was actually given a very generous cutoff point for being considered "active" especially with this round of cutoffs compared to previous migrations.