It's not that they think zig will avoid the issues, but rather that the cost required to do so is too great, so they would rather have a nicer language with more traditional ways to catch those bugs. If things like memory tagging continue to take off, hardware will catch these issues anyways. I don't personally agree but they are allowed to have their opinions.

More than memory safety, I do think thread safety is a bigger challenge I'd love more modern languages to tackle.

People are allowed to have whatever opinions they want, sure. I've seen numerous advocates of Zig defend the idea that "in practice" it is about as memory safe as Rust, something that's clearly not true. That's the part I find weird, not that people enjoy using unsafe languages.