"Is it not?" in a rhetorical question. It is fashionable of late, as regards the Biblical Hebrew parallel form, to see this word as a pure demonstrative rather than a combination of the interrogative h_ and the negative lˀ. While this may in fact be the case for some Biblical Hebrew examples, it is almost certainly not the case in Aramaic, contra DJPA s.v. The interrogative contexts of our examples are usually quite clear.