Thanks for checking. I was wondering whether moodle.org is decaying (aka organic growth).
> I can reproduce your use case.
>> a) Visit the discussion https://moodle.org/mod/forum/discuss.php?d=251402
> In b), I'm not sure that I used to get the page you mention.
i'm pretty sure. I could not only see that visitor has left "Moodle in English" but also know when he left.
> And contrarily of what your title post says, the profile is not hidden, just awkwardly accessible: https://moodle.org/user/view.php?id=1611963 or https://moodle.org/user/profile.php?id=1611963
Any information which needs URL-guessing is _hidden_ for the vast majority of visitors on moodle.org!
I repeat: Contrary to what https://moodle.org/mod/forum/user.php?id=1611963&course=5&mode=discussions says I can see posts made by that visitor, example https://moodle.org/mod/forum/discuss.php?d=251402.