[heinrich5991]

It can only do that if you add it to the preload lists of browsers (which is mentioned in the article).

But even if it is not, it's still helpful for people connecting to your site again.

[tialaramex]

And because the preload list is hierarchical whole swathes of the Web can be covered with a single entry. .dev is the biggest example, but they can protect all the stack exchanges, all the default blogspot blogs, that sort of thing.