About 1/3 had not been previously seen in the have I been pwnd database, that’s really crazy. Either this was a very new or private list of exploited accounts.
The good thing (for me personally) is that only some very old mail aliases of mine are in this collection. Which means that using a password manager to create and save all my passwords for years does have a positive effect.
A password manager is irrelevant for Have I Been Owned, since the site only matches emails, not passwords. Also, that site includes mega lists which mix and match data from different services as well as spam lists... Not terribly useful.
PM's and avoiding reuse are still vital despite that.