Now what you want is us to take your personal view of this person as read and ignore his clearly laid out position. So really you're the one being ad hominem, though unusually being supportive (I prefer 'enabling') rather than attacking.
Let's forget who this is and discuss this person's job ad.
EDIT: A pre-emptive clarification: The fact that one could do research on this person makes no difference. The ad is the ad, the details of the person who wrote it are actually irrelevant here.
Merely attacking someone does not an ad hominem make; since ad hominem is based in the study of logic, calling a personal attack such as the comment up-thread "ad hominem" makes no sense. The person posting the job is not entering into an argument.
We can reasonably consider this implicit position and draw conclusions, and yes absolutely, because something happens to be a personal attack, it isn't necessarily ad hominem. Saying 'ignore what this person has done and listen to me telling you he's a great guy' very much is.
Ad hominem: "Higher taxes are bad because you're the one suggesting them."
Personal: "You are an idiot for suggesting higher taxes."
See the difference?
How about being a decent reasonable human being/employer? Or is that just off the table altogether in this discussion?
With limbo-like justifications like this I'm not surprised these kind of diseased company cultures exist.
This is exactly why labor law exists and why libertarian/extreme capitalist societies could never function. The argument "it's a free market" doesn't hold water. Without a system of checks and balances exploitation will always take place because there are always people desperate enough to do anything to make a living. No matter what you say about "free markets" and "voluntary agreements", you can't convince me that it's right and ethical and a good idea in any capacity.
In the entire category of white-collar jobs the idea of requiring labor laws is ludicrous.