how a gold neeko, leblanc, and ivern with shitty items beats. a gold 
kogmaw, 
gold braum, gold 
skarner, gold 
and the item that refreshes a shield every 3 seconds renekton, a gold warwick with a thresh and azir mixed in. 5 golds loses to 3. nice.
The woodland has 4 golds, including the spawn one.
The rest is about positioning. Your frontline champs with PD aren't dodging much when the LB isn't being affected and slaughtering your kogmaw so he dies so early and does no dmg.
Well you failed to mention the rest of the woodland team and I'm assuming there was a tank and maybe another assassin in there. Games aren't won by how many gold units you have and with the Neeko and LeBlanc abilities, there is also a large random factor to consider. You might have lost once, but perhaps if you did the same match 10 times with efficient positioning and better luck, you may have won more than once.
Rigged game, i think they implemented a subroutine which mark some players to deal less damage.
Leblanc will likely alway kill one back line in general also kog is a perfect target since he is squishy. Guisnoo is bad for stacking on short burst
