That's just the basic club-stats endpoint, not one of any size. It's getting so I can't produce a set of 'clean' results for a few dozen clubs taking part in an event.
This is starting to be a nuisance!

They're currently facing a lot of issues with the endpoints it seems. The stats API in general seems to be entirely messed up. Any club also over something like 29,000 members also seems to be affected

The stats endpoint is returning timeout rates that are different from the player's profile page as well.
Now it's Team Colombia that's got a problem...
https://api.chess.com/pub/club/team-colombia