The important thing is, what's the overlap between vocal users, and reddit contributors. It's always been known that reddit (as well as most of the internet really) is driven by a small % of power users. The posting, the commenting, the moderating. /u/spez says 90% of users use the default app, but I would wager that if you look at people who are actively contributing, that number will be much different.

Every person I know who uses reddit app does so very passively. They are read-only users who just ingest posts and rarely contribute. Yes the vocal minority is mostly mods and power users, but the argument here is that those are also the people who make reddit what it is.