“Why should anyone believe..”
Vulnerabilities are found constantly, that’s a feature not a bug.
Apple has earned a decent amount of respect in this area. They have also earned a healthy verification of whatever security claims where are due to some pretty high profile bugs.
If you're talking about the iPhone, yes. But they lost a bunch with their desktop computers with this unaddressed, apparently very real problem. Unless there is some news and it turned out to be a hoax? But it seems real.
