Like...they could pass it off that way, and it would...work, and I wouldn't be like "That's total BS guys.", but I think it's a lot more that they...sorta forgot that point. Cause when it was stated it was very like "Bwa ha ha! It's an angel cause only ANGELS can kill angels and we duped you!"

But like...there's the points you brought up, and the fact Cas wasn't like "Hey, guys, lemme take the shot at Lucifer, so it's not negated by y'all not being angels."

But yeah. Clearly it's NOT true. So maybe Uriel was just fucking with them.