I mean I deleted my account. They probably realized they're getting a ton of account deletions and went back on it.
FTFY...
It's hard to gauge significance without knowing a number of total users, but I imagine it is a relatively strong hypothesis that there is significant correlation between regular browsing of HN and having an account on his service.
I think you're running into the pagination problem: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
If you scroll to the bottom and click More you should find it. Edit: yes, it's there: https://news.ycombinator.com/item?id=23304097.