The article claims the official story is unclear, but I disagree. As a potential customer, I've learnt everything I need to know to protect myself from vulnerabilities. (Though the inner hacker would like to hear how their infrastructure was compromised and whether it can have any effect on related services, such as Fastmail.)
Opera also states the security breach has been handled on their end, so I see nothing wrong with the announcement's title either.
It would be unfortunate if the situation got out of hand, with recent fundamental changes to their browser, Opera now needs 100% focus to stay competitive.