No, that is not the point of that website. The point of HIBP is to inform you when accounts have been compromised in the past and highlight why you need to use seperate passwords for each site. You seem to be worries about attacks called Credential Stuffing and that attack is completely useless with a different password per site.

The site creator and owner Troy Hunt is a national treasure and you can check him out online to see his ethos about security.