Ever since the site redesign in May, popularity has been falling (source: Alexa Top Websites): https://www.alexa.com/siteinfo/reddit.com I hope that affected the amount of money they raised. As a reddit fan, the site redesign has not been pleasant. The mobile experience, too.
Their official blog posts continue using that same 330M number: https://redditblog.com/2019/01/23/health-fitness-on-reddit/
The TechCrunch article does as well.
Either their number of active users hasn't changed at all in over a year, or they're actually shrinking and deliberately just staying with an outdated number that looks better.