This doesn't seem right. March 2019 through July 2020 - that's only 17 months. Where is the 18 coming from?
I'll satisfy your OCD: Theymos started his
DT update log on March 5, 2019. Theymos made 17 posts in that topic, each with 2 categories: "Old" and "New". That means "Old" in his first post is a list of DT1-members from the month before March 5, 2019. And that brings the total to 18.
I just noticed only 128 users were eligible this month, 12 less than last month.