Randomex:
It doesn’t specifically refer to the post being responded to. It refers to the most recent post.
As for the actual question:
Chizkiyahu said ??? ?????? ??? ???? ??? ??? ??? ???? ????? ?? ???. Why didn’t he say ??? ?? ??????? ???? ?? ???? ??? ??? ??? ???? ????? ?????
Presumably then, the kal vachomer is from the Shunamite as opposed to from the kid. If that is the case then we have a problem – by the Shunamite, the one who did the good deed was the one who got helped whereas by Chizkiyahu, the one getting helped was not the one doing the good deed. So the kal vachomer is no good. Unless you say that the good deed of King Solomon was so much greater than the good deed of the Shunamite that it outweighed the fact that it wasn’t Chizkiyahu himself who had done it. But we don’t usually make kal vachomer’s like that. (Perhaps one could say that Chizkiyahu wasn’t using the actual middah of kal vachomer, inasmuch as he was just making an argument.)
I know this didn’t actually address the question.