I see that SHRTURL deleted the page title, which users might also notice – but it’s better than keeping the original title, which would now be wrong. SHRTURL also can’t handle GitHub’s custom font with which they render their icons, so the site logo is missing. And you are logged out in the linked page, which is pretty visible, but there’s no way SHRTURL could get around that.
The OP's site is really clever. Your Github page shows that it significantly lowers the barrier to MTM attacks. I wonder what ways there are to protect users against this kind of spoofing.
I see that SHRTURL deleted the page title, which users might also notice – but it’s better than keeping the original title, which would now be wrong. SHRTURL also can’t handle GitHub’s custom font with which they render their icons, so the site logo is missing. And you are logged out in the linked page, which is pretty visible, but there’s no way SHRTURL could get around that.