Joel;
Tom Paul can give you better details, but no, Fazio didn't "fix" those convex "splash-up" areas on 8 & 13 at Merion.
It was apparently determined that taking them down to their original heights would be too chancy, given today's green speeds...the old "unexpected results may occur". I can understand their caution.
However, during the bunker rebuilding, the bunkers were dug to their original depths, so what you now have is a bunker that is effectively much deeper than when built originally by Wilson/Flynn.