This started as a comment on this meta question, but I don't understand what Jeff told me, so I'm posting this as a question. Sorry if I'm just not seeing it :)
The question asked why some profile field labels are red. Bobby answered they are "private fields", which only mods see. Jeff then answered they removed this indicated, as they were used inconsistently and it was ultimately more confusing than useful.
I'm asking why some profile field contents is grey. I asked in a comment on Bobby's answer, Jeff told me he already answered - but I really can't find it. I see what red labels did, I see they are removed, but nothing about grey text. And grey text was not removed: I still see it.
So, what is the meaning of the grey content on certain profile fields?