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Japan sets new internet speed world record — 4 million times faster than average US speeds
(www.livescience.com)
This is a most excellent place for technology news and articles.
The actual source: www.nict.go.jp
Not really an 'internet' world speed record, but really a wired data transmission record if I'm reading correctly.
It's a record in data transmission. The medium doesn't matter.
The title is 'internet', implying a network of networks. The title wasn't 'new record in data transmission speed'.
Article explains. You don't read it.
Of course I read it, and investigated the source. The issue is with the title the article chose.
Theoretically, you could always increase the speed of data transmission by using more cables in parallel.