I can't understand how did someone capable of understanding and doing a git pull request can produce this kind of "code". Or how did he think that he can pull

I can't understand how did someone capable of understanding and doing a git pull request can produce this kind of "code". Or how did he think that he can pull this thing off? is there a "10 ways to hack a website" where a git pull is one of them? The fact that there is a code snipped a tutorial on "How to Create a Website With Notepad" and the whole thing seems like it came out from an old WYSIWYG editor, the thing obviously was made by a script kiddie. script kiddies uses git now? wow