[sitkack]

Attacking anything other than the argument itself is fallacious. The core of tenet described in Ad Hominem is that the argument is being diminished because of who is delivering it, if it is a person, a robot, a magazine or parrot doesn't change that the argument itself is being ignored.

[epistasis]

That is absolutely untrue. One can comment on the unreliability and inappropriateness of a source without impugning the material, and that's exactly what's been done here. I don't think you are fully reading what was written.

[sitkack]

In a rhetorical sense, yes. But it doesn't invalidate the logic of the statement. Your viewpoint would that of an attorney, not a logician.