Cyril has been gone for the whole House Dagna stuff, but he's heard of it. Seems a bit unnatural to him, but if it works against the Darkspawn he's not going to complain. After all, he's a Warrior caste turned surfacer smith, so he doesn't really have the right to say what is unnatural or not. He's also only been a smith for the past fourteen years, so he knows that compared to the real smiths back in Orzammar his work is nugwash. He would still talk about it though, and she might even be able to follow along (which is more a remark on his making sense disability than her listening skills)
The market is just full of strange people, and Cyril is absolutely horrible about keeping secrets- as in he can't keep them. His competitive streak with his cousin Gorim (also working in the marketplace) should be well known. He'd probably actually buy some stuff off Ignacio and Lucressia, just so he could study it. Although his suspicious and slightly paranoid nature would make him hard to get close to, especially with all her disappearing.