Unfortunately, I didn't realize that there were actually 3 sets of videos in the archives when I played through Lair of the Shadow Broker. By the time I knew, I'd already finished all of my sidequests, so I couldn't go and do a mission to trigger the 3rd set to show up. I ended up just importing my Shepard to Mass Effect 3 after having only watched 2 of the sets in the interest of time.
Now, during a conversation with Matriarch Aethyta,
Shepard mentioned that she saw a video of her staring at a picture of Liara, which prompts Aethyta to admit her parentage. Do you still find out about Liara being Aethyta's daughter if you haven't seen this archive?
Essentially, I'm wondering if I may miss other triggers based off the set of videos I missed... Is Shepard's mentioning of the video merely an added bit of flavor if you've done the DLC, or is it a needed trigger in order to find this information out at all?