Kirk's KHAAAAN in TWOK made no sense. he knew he was just buying time for Spock to repair the enterprise and beam them out in 2 hours. Was that just theatrics to fool khan into thinking he didnt have that ace up his sleave?
Yes. Kirk's shout was pure theatrics. He wasn't aware they'd get to hang out in the area Marcus created, but he knew Spock and the Enterprise would be back, soon.
Is it possible that the present filmmakers didn't catch on to that? Admittedly it's possible to miss it when first seeing TWoK
, at least if you first saw it with a boisterous audience during premier weekend in 1982. Maybe if Shatner had winked at the camera after doing it...