obv. he is faking it somewhat, kizaru is not in hurry, he usually do things fast, and even the goroshit pointed that out, kizaru dont want his friends to die, while its true that its not like kizaru can have the upper hand with luffy but he is not that worn out as he looks (ig), I mean he bringed food to luffy (prolyl) so he can atleast move and help but he dont want to