If a website says "Do this" and you're the person who follows random websites against security practices, because you believe in authority, a password manager does not help. You will open the password manager, search for GOOD.com and put it into BAD.com and be angry that your password manager can't do that for you.
"Any human can be tricked, no matter how smart they are."
and
"A password manager will protect me from doing the latter."
Don't work together. Either everyone can be tricked or not.
It says "Everyone can be tricked" but I can't be tricked because I use a password manager.