The only point of confusion is what to call someone that has been recently reactivated. Say, someone that has been inactive but turned in a field circus time during the early months of the year. Some of those could later go 6 more months without a field circus time, rendering them inactive once again. Others could have continued turning in field circus, at least once per 6 months. This is listed under "inactive"--even though the directive tells them not to count anyone that remains inactive from previous years.
Aside that, all it takes is someone to be active (even if irregular) since March 2020. Turning in a single report since March 2020 is enough to be counted here. Which is basically another way to change the definitions and put out better looking numbers. There are going to be more people turning in time during one or more months during this window than the average--possibly even peak (if they turn in time during different months, they will be counted cumulatively instead of per month). It doesn't answer what if someone turned in time earlier in the year but stopped before March 2020.
It also doesn't answer the question of who, according to their own theology, would be eligible to survive Armageddon. Many will turn in a time just to turn in a time, or remain loyal just to ruin others' lives (including children). According to their own doctrines, such will not survive. If you just count those who, according to their own theology, would survive Armageddon, the numbers are way smaller than any of these. I would estimate they would be lucky to see 500,000 in that category regardless of how they count irregular or inactive publishers.