Yes, they're more "this is bogus science and I am disgusted by his conclusions from the bad science" than they are robust philosophical argumentation. As I note above, this is philosophically tainted and not the strongest refutation to give to those who might be convinced by Craig's argumentation; I assume they're assuming their readers are familar with Craig and his habit of starting with the bottom line.

The trouble with the question "does a given animal feel pain?" is the particular usage being applied of the words "feel" and "pain".