I’m not. Why would anyone believe marketing speak for any product? One should always assume that at best they’re fluffing their product up and more likely that they’re telling straight up lies
1. False advertisement is a thing, to the point there are laws against it
2. They were caught blatantly lying, and you're literally telling everyone it's the users' fault for not digging into the black box that is Claude Code (and more so Anthropic's servers) and figuring its behavior for themselves. A behavior that suddenly changed on a March day [1] and which previously very few people ever needed to investigate.
I'm not saying this is a great state of affairs. But I'm saying that it's so pervasive in daily life that yes, at least part of the blame lies on users for not taking this into account. As a developer it's important to at least try to understand the tools and libraries on which one relies. Relying on magic black boxes is not a good plan on the user's part, and they need to be defensive about this. Too many developers have been more than happy to hand the keys over to the AI assistants and hope for the best.
Also it wasn't completely undocumented, rather it was hiding in not-quite-plain sight. Which itself is a bit duplicitous, but again something that's far from unique on the part of Anthropic.