Yeah. I saw the dead website earlier today and have been trying to figure out how to keep the posts working.
The fediverse software post, I could rewrite some code to gather fedidb daily (to my knowledge, they don't have all time series data available), but their MAU math is suspect. So, not a great option, but my only other thought is basically remaking fediverse-observer and I do not have a server or potentially relevant server skill set beyond cron jobs.
For the threadiverse instances post, I can keep gathering data from the instances I already have in my database, but don't really have another way to find new ones. Maybe, I could see if I could scrape it from fedidb (I couldn't get their API working in the past).
In conclusion, the posts are not in a good place :(