Norton heart bleed check website

I checked a few sites using the norton heartbleed check website.
Am I missing something? Is that check just giving the current status rather than the initial vulnerability status? I’m wanting to know if I need to change my password. I know the capital one website was not effected by the heartbleed, as stated on their website
But I know yahoo email was effected and passwords needed to be changed. However the norton check site shows yahoo as ok
So if folks use that to check they will not know to change their password