Yes, there's always going to be outliers, that's how statistics work. That LD50 is 192mg/kg just means that 50% will have died by that point. Some individuals can survive beyond that point, while 50% couldn't.

I'm not saying that 50% of the population will be honky dory a-ok after surviving, what killed the first half. Just that it's not unlikely that you could survive consuming 18l of red bull over the course of 10h23m. You'd probably still be pretty fucked up, but surviving is a subset of being fucked up, not the other way around.