If I look for a community on it's own instance, does it show me total number of subscribers from all instances then? Because it seems to give me the same amount of subscribers for the communities I looked up via the link you posted.

Maybe I'm just dumb, but looking for posts on Lemmy via Google doesn't seem to redirect me to any post on Lemmy? For example 'Beginning tips running lemmy', doesn't redirect me to the !running@lemmy.world community even though there's definitely a post about it with helpful information.