ذَلِكَ الرَّجُلُ صَادِقٌ.
Translation: That (distant) man is truthful.
ذَا: demonstrative base in nominative syntactic position. ل: distance marker. كَ: addressee particle, no syntactic case. الرَّجُلُ: nominative apposition. صَادِقٌ: nominative predicate.
Do not parse this kāf as a genitive possessor.