Anthropic has reversed that decision. (But that just happened so it might have been true during the article's testing.)
Not sure if it's wise to trust them again even if they say they reversed it.
I was just coming here to post this reply to myself! You're absolutely right! :)
Honestly so glad to see the reversal.
When I reported this, Anthropic sent me an email on Tuesday saying, "You have been approved into the Cyber Verification Program", but it's still downgrading. Is this a bug? What's the point of the Cyber Verification Program if Fable 5 downgrades when you tell it to write secure code?