Isn't the famous footprint photo acutally one of Aldrin's, and deliberately made to test the compaction ability of the soil?

Yes. AS11-40-5876 through AS11-40-5880 were taken for the benefit of soil mechanics experts and are of Aldrin's bootprint some distance away from the LM. In fact, he was specifically told to find some reasonably pristine regolith. 5879 was an inadvertent exposure, but then he thought it might make a good picture so he framed it a little more carefully and took 5880.

A lot of the apparent "cloudiness" is obviously motion blurring in the exposure.

Quite possibly. There's no way to distinguish motion-blurred particles from the frozen image of many small particles. There are two problems with the argument: the one you've noted where "cloud" can be variously interpreted, and the author's erroneous assumption of the ballistics.

So somebody from the very large nasa.gov domain clicked on his site. Doesn't mean anything does it?

Of course not. You can only infer a very little bit from the record of a web hit. But the author is all too eager to infer a cause.

I'd say this page was pretty low, but actually the low point was looking at the guestbook ...

I was amused to see someone agreeing with him who claimed to be an engineer. I would love to have a conversation with this person and see exactly how much engineering knowledge he has.