You may have been hit by 2 issues at once. Did you try the instructions as I quoted? I know when I first posted I gave everyone general ideas but the other person gave step by step details.
The above doesn’t do anything bad. Just would clear out of Google and all, then make you sign in again. But a lot of times what they do is slide stuff in along with their cookies to identify you. So if you don’t clear it, then once they “flag” you then it remains until the cookies are cleared out. Fortunately it hasn’t seemed to flag on an account level (yet), but yeah…