I would have tended to agree with this, apart from the fact that Firefox on desktop (v60) does not keep the create account page in its cache. It prompts for a 'Try Again', followed by a 'Resend' popup, and eventually you get back to the create account page. Chrome on Android does something similar but at least it's one step less. There's no issue on Edge and Chrome on a desktop.
Interestingly, and I have never paid attention to this before, opening a new tab on Android Chrome the back button (on the device) does work, in fact better than going back within the same window.
So given desktop users can easily select the original tab and that mobile users can use the back mechanism (at least on Android Chrome) to return to the original page, I'm inclined to add the target="_blank" to this link.
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