Want me to go through some ways the anon might not have known who she is? 1) He's actually aware of Keisha, but never paid attention to her name before, or forgot her name, or didn't recognize her from a few frames in an ad (hell, in my drunken state I swore it was Tori Black when I first saw the pic).
2) Unless you have absolutely no life outside of watching porn (which is probably true for you, since you're here being an asshole) there's always a moment when you go from not knowing a pornstar - to knowing a pornstar. And there is a delay for many people. I had played wack-a-pole to many scenes of Alexis Grace for a long time, but never paid attention to her name (she just showed up in suggestions when I was in the mood for "busty brunette femdom"), by the time I saw the name "Alexis" and decided I wanted to rewatch some vids of hers I had seen before, I discovered she went by Alexis Grace, and in the comments of one of the vids, I also found out she was dead. So, with no more time/thought that some of us (non-complete losers) put into porn/pornstars, it's possible to not know who a fairly popular pornstar is until they are already out of the business. 3) He is a porn industry novice. Meaning he goes to pro porn much less frequently than he does non-pro homemade amateur/cam girl type porn. So he doesn't care to learn of many pro hoes unless they happen to impress him, then he comes somewhere like a category focused on pornstars and thinks he can ask for an ID from guys who are more likely to recognize pros.
There's more I could teach you, but I'd have to break this up into 2 posts, and an asshole like you just isn't worth that.
Sorry. Alcoholic here. Didn't mean to click to start a new subject. Please ignore this misplaced retort.