Hmm...I know what you're referring to, and yes, he did say that the "small pools are no longer there." But the sharp rocks that would cause the scars should still be there if he did go digging, right? Whether or not Ruin made him go or he did it on his own after Sazed ascended. IDK, either question I think could be telling in how he answers. Ahhhh it's so hard deciding. Everyone feel free to make suggestions to polish the question.
BTW, in looking that up I confirmed that Ironeyes IS Marsh according to Brandon. So I spoke too soon on that part.
I don't know how to link, copy/paste isn't working, but if you go to the Interview database and click on "atium" it'll take you to what I was looking at.