It may have but this research doesn't show that. It appears to be in questions, rather than answers, when I can find a page that hasn't been removed. Beside mos

It may have but this research doesn't show that. It appears to be in questions, rather than answers, when I can find a page that hasn't been removed. Beside most of these not actually being there, the google result is for answers which additionally have been ranked by Google. The thing you link is not meaningfully comparable to the Google result, nor is it representative of 'if you search for something on SE, how often does it tell you to put SQLI in your code'.