I think you're totally wrong about the interpretation, but who knows what Struth meant if anything by these. Unlike maybe Stephen Shore or even Alec Soth, Struth's photographs seem to me to be much more just about the equipment. He seems to think that anything taken on large format and printed really big is art. Personally I find his work bland and utterly devoid of anything even remotely interesting. The author of this piece has the advantage of fond memories of those banal forest scenes, but to the me they are without artistic merit. I don't like any of Struth's work though. He's a fraud in my opinion.
And as for this artistic interpretation "Imagine [as] if it were an abstract painting" is a ridiculous one. It's as valid as me saying imagine it were actually an interesting photograph.
Then again, the world needs art historians as about as much as birds need bird watchers.
One thing we can agree on, the CfA2 Great Wall is awesome.