If I was about to go on tour with my best friend and he said something stupid that put us in danger from real life lunatics with guns, I'd fucking cancel the tour too because I cared about us both and our relationship. Besides, if you can't tell your friends they're wrong when they're wrong, they're not really your friend. This isn't necessarily the act of betrayal you're making it out to be.
I'm betting that making this statement publicly makes it easier to break the tour contracts, rather than backing out of the tour without saying why.
You know what's also good "built in AV"? Good design with code that's open to review. There's not nearly as much performance cost to good security if you start from a good foundation. Saying windows is slower because it's doing more security and more anti-virus is like saying I only run slow because I trip over my own feet. Like, no shit, but that's no excuse.
And singing the praises of updates and rollback systems that are like a decade behind everything else and still a consistent pain point for users is a little bit of weird fanboyism too.