I don't think the intent of the profile page is to fully conceal the provisional rating. It is mainly to avoid seriously confusing newcomers with the wild fluctuations of the first few games and to emphasise that the rating for the purpose of calculating the impact on opponents is locked at 1200 for the first five games.
It's not difficult to calculate someone's rating before they have finished five games (although it is tedious.) Just look at the results of their public games and check their opponents' ratings by looking at their profile graphs. With at most four games to deal with, applying the provisional rating formula is not too difficult.
Of course, now that you have discovered this 'feature' of My Buddies, it will be much easier to do the check that way