[jsmthrowaway]

To be more clear, ad hominem is attacking the person making an argument as an illogical response to said argument. It's attacking the argument by attacking the person making it.

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.

[singular]

Yes, you're right, other than the idea that the job posting isn't entering into an argument - I'd say that it is, the person is taking a position that they feel this is a reasonable and justifiable job to advertise.

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.