In cloudflare you can block access by country with just a few clicks. The point of this article wasn't to completely restrict traffic from one country, but to

In cloudflare you can block access by country with just a few clicks. The point of this article wasn't to completely restrict traffic from one country, but to reduce the vast amount of garbage/bot traffic that is generated by regions outside the US (like russia, for instance). Of course it can't stop simple use by VPN, but that wasn't the point. That would not really be "garbage traffic" unless it was a distributed attack. That said, this article is light on substance.