Yeah this seems recent, and I am sure it's for those who have it set to friends only, models only, or no one at all.. So depending on the setting, it will depend who can see it.
I do think this is one of those silly changes and should revert back to being able to see some info, especially how long the user has been online. I mean, now even grey users have this hidden too.
It;'s a good way to help models identify real/recent or potential tippers without having to add them as friends and get spammed etc
Being able to identify if a Grey registered 24 or 38 hrs ago versus years ago makes a big difference for a model, the same if they are of a certain colour.