"But he is still what he is." Strange is hesitant to outright say 'but he's still a True Fae', though it's pretty obvious that's what he's talking about. They were fae enough to be burned by the iron, perhaps Ignatius would be fae enough in other regards? Heck if Strange knows what said regards would be, though.

"Anyway, wherever he is, I don't want anyone to connect the dots and figure out his, erm, everything. I need to find him, no matter what."