It works for me, without a qr code

The original link did not work for me. It displayed the article for a couple of seconds and then popup said "register for free to continue reading this article." When I clicked on the popup's 'x', it redirected me to the front page.

Consider that other people have different experiences of things. The TFA link doesn't work for me (it appears to, but then it forces me to register to keep reading) and the archive link just required a standard captcha.