No, what matters is that the MC knew about an incoming attack enough to make defenses and told absolutely no one. When you step back and actually think about it, it's fucking insane.
I'm the type of person where if my son knows about an incoming attack long enough to take defensive measures, I'd like to know about it.
I do love how you try to brush it off as something insignificant though: "Jeez, stop harping on about it dad, it's just some demon guy coming to massacre us. What's that? Yeah, I knew about it for years but that's not important, the main thing is we're all still alive #nakamapower"