Wow, big dark UX pattern when trying to sign in now. I'm quite positive that I never linked my glassdoor account to google. Yet, Glassdoor was ambiguously saying on login "use your google account to login for your @gmail address!". To which google asked "are you sure you want to share info with glassdoor."
There was no way to enter my old password, I was forced to now link my account with google which force shared my email & name. I was really nervous about even enabling this linking... I bit the bullet, happily it looks like it is somewhat easy to delete reviews and finally the account. Getting there though, was forced to divulge new information.
I don't think I could have a lower opinion of glassdoor now..