I agree that they can be but based on my experiences, git or Github do not mean code reviews even if pull requests are used.

I understand, but that was not what I was saying. What I was saying was that Git, with Pull Requests, give a solid foundation for code reviews. It's easier than ever to do code reviews, and there are more code reviews than ever before in my opinion. I review code all the time in my team, and so are my teammates. So while Git and pull requests do not mean necessarily that there was a code review, what I meant was that there were more code reviews than ever. In the Open Source community, I am pretty convinced that most pull requests are code reviewed. Otherwise, the community could not survive.

So in conclusion, what I was trying to say is, code reviews are absolutely nothing new. Just look at the results of this survey: https://www.slideshare.net/SmartBear_Software/2014-state-of-...

And as for the article "Why Agile Is Dead: Long Live The Code Review!", I think it's trying to talk about a problem that is not really there. For me, personally, there is no problem with Agile. And there is no problem having code reviews in a Agile environment.