From an European perspective labour in the US is cheaper

All the countries in the EU: https://en.wikipedia.org/wiki/List_of_European_Union_member_...

This is completely factually wrong.

I understood the author the same way you did

for me too

oh man that was fast. here is a backup http://lazymastodon.com.s3-website-eu-west-1.amazonaws.com/

I have found the link from the article very interesting.

https://spectrum.ieee.org/energywise/energy/renewables/diggi...

It is basically using ramjet technology (such as in the Lockheed D-21), but it's kind of the inlet shape which moves through air enriched with combustible at hyper-sonic speed, on impact the projectile just vaporizes.

edit: the gif animation at the top of the article is very misleading

Unfortunately, my company's proxy blocks Twitter, so I am happy with this link ;)