I'm absolutely right

As I opened the website, the “16” changed to “17”. This looked interesting, as if the data were being updated live just as I loaded the page. Alas, a refresh (and quick check in the Developer Tools) reveals it’s fake and always does the transition. It’s a cool effect, but feels like a dirty trick.

It's a dark pattern

Maybe I'm old or just wrong, but "dark pattern" for me means "intentionally misleading" which doesn't seem to be the case here, this is more of a "add liveliness so users can see it's not static data" with no intention of misleading, since it seems to be true that the data is actually dynamic.

I wouldn't go so far as to call this specific implementation a dark pattern, but it is misleading. It suggests the data updated right when I loaded the page, which obviously isn't true as I can see the same 16->17 transition on a refresh.

I'd prefer a "Data last updated at <timestamp>" indicator somewhere. Now I know it's live data and I know how old the data is. Is it as cute / friendly / fun? Probably not. But it's definitely more precise and less misleading.