Apparently, the author is John Walker, author of AutoCAD and founder of Autodesk. Pretty impressive credentials.

I have to agree. Although there is little in common between CAD software and astronomical modeling software, I've worked in the innards of both kinds of software. If you or I can understand both problem spaces well enough, there's no reason why an eminent software professional would have difficulty mastering both problems.

I've already mentioned the problems inherent with the type of modeling these programs typically use. I'll have to download it myself and see if I can determine the methodology. That helps us understand whether to attribute error to the software or to the operator.

You say you confirmed that Sky Map and Home Planet gave you the same results. (A good bit of conformation, by the way, and evidence that the software is not really at fault.) And you said that Sky Map showed that the Apollo 11 landing site had been in darkness. Did this refute the author's assertion that it was actually in darkness at the time of the landing? Is the author simply misreporting the results? Or is the author correctly reporting what these programs say for the given time and place?