I would prefer to read "Why unique passwords matter more than ever". Most online services have rate limits established, e.g. you only have a few tries on your password before google blocks further login attempts.
But if you use the same (or very slightly altered) password for many services, there is a real risk that one of the services gets hacked, your password leaked and attackers use this against your other services.
But of course, the suggestions in the article (password manager + MFA) are still valid and useful.