Only available in the US. 95% of people do not live in the US. I do not live in the US. No-one I know lives in the US.
I can imagine plenty of valid reasons for not being able to ship a brand new product outside of the US. The author didn't promise anyone that at least 6% or more of the global population could immediately order this product or anything. In any case, most of HN probably lives in the US.
> In any case, most of HN probably lives in the US.
I agree with your main point, it's not up to us where someone sells their product, but I'm not at all sure that most HN users live in the US; I don't have any more evidence than you, I would just assume most are outside.