Here's an example link of me on another server https://cosocial.ca/deck/@boris@toolsforthought.social
If you're logged into CoSocial, that will load my profile and you can browse the whole thing.
If you're not logged in, it should redirect to the remote profile (try it in an incognito browser window)
I guess Pleroma doesn't do that, but it SHOULD, precisely because of the indexing thing.