I think that is the slide Lola was talking about, only she took his disappearance to mean he went back to the Warden to help her find a cure as he had originally planned.
Yeah, that's what I'm thinking, that maybe she just heard it wrong, or didn't catch the part about how he disappeared, but specifically into Weisshaupt. I know in my first playthrough I wasn't fully paying attention to the slides and had subtitles turned off, so several parts of the ending went right over my head. Including the lines about the Wardens from the South and the Wardens in the Anderfels being at war with each other and Weisshaupt suddenly going silent, I had to go back and watch it again after I saw it mentioned elsewhere because I completely missed those ones the first time.
I'm anxious as all hell about that last part, because if she disappears into the fortress and soon after all communications cease, it means my Hawke still isn't safe, after all this. And according to Varric, Sebastian and Bethany went after her, so now they're caught up in this Warden mess too. :\