There are terrible misunderstanding of Creationists' claims here.
Which Creationists? You talk about "Creationists" as if they have a single, agreed-upon set of explanations for natural phenomenon, which is clearly not the case.
The TalkOrigins article was specifically countering specific claims made by Hovind, a creationist.
Apparently, this Talk Origins' author thinks that Creationists might make one of TWO arguments for the Mississippi delta.
The Magical Hole Theory
The Amazing Sediment Theory
When misstated as above, the Creationists' argument does look foolish.
Perhaps you should reread the article, since that is NOT what the author was stating.
The author was stating that, in order for one of Hovind's claim to be true, one of those two, outlandish cases would have to be true. The author is countering Hovind's claim by the absurd conditions that it would require -
the author never claims that these conditions are put forward by Creationists.
In regards to your "Shearing Theory", unless you provide evidence instead of speculation, it likely has as much going for it as the "The Magical Hole Theory".