I clicked on that link and got a page that says "moma: inside google. Single Sign On" and asks for a Google login, password, and OTP. It also appears to display a random image; I wonder if that random image is used as part of the authentication process, perhaps as an authenticator that this is a valid Google login page (perhaps something you can verify with your OTP device).
https://devsite.googleplex.com/chrome-developer-tools/docs/r...
I clicked on that link and got a page that says "moma: inside google. Single Sign On" and asks for a Google login, password, and OTP. It also appears to display a random image; I wonder if that random image is used as part of the authentication process, perhaps as an authenticator that this is a valid Google login page (perhaps something you can verify with your OTP device).