This wasn’t a mistake, that’s literally the whole point Nolan built the scene around. He said directly, if the horse looked untouched by the tide, the Trojans would never buy that anyone could be hiding inside. The flooding and men drowning wasn’t bad planning, it was the actual price paid to make the trick believable.
Nolan placed the horse in the tide on purpose because a dry, pristine horse would’ve looked suspicious to the Trojans. Soldiers drowning inside wasn’t an oversight, it was the brutal cost of selling the deception convincingly.
“black girls have a smaller dating market”, “black girls are less desirable”, etc stuff has never moved me bc i know im attractive, i know black girls are attractive and since i dont need to date everyone, ppl unattracted to me don’t matter