I didn't take it that way, actually. The question itself is directed toward the oft-cited claim that it's "philosophy" rather than science -- esentially a claim that identifying design is scientifically impossible. Aside from the obvious -- we do it all the time -- the claim itself appears to be unscientific, and based on the assumption that we can't detect it. It raises the question of whether or not it's cited as a matter of dogmatic convenience.
The problem with the claim is that it ignores the fact that doing the manipulation sits firmly in the realm of science. It makes very little sense to claim that science can do something, but is then incapable of then detecting what it did. It might well be difficult to do so, especially long after the fact. But an alleged inability to detect the results of scientific manipulation would be due to a weakness in the detecting science. And an inability to detect long-ago design is scientifically explainable as well.
If we do suppose that the detection of design really does belong in the philosophy dept., would it not then be logically necessary to relegate the identification of "non-design" to the same dept.?
Absolutely! In fact, I've made that very point on an ID thread just a few weeks ago. Naturalism is itself a faith.