So... a super fed champion 3 to 5 levels ahead of everyone at full build can easily win in 1 v 1 scenarios.
I don't see a problem with that.
Give that much gold to more snow-ball-y champions such as Riven, Yasuo, Ekko, Ahri, Vayne, Kalista, Jinx, etc. and they will actually penta the enemy team.
Besides Xerath and Thresh, they pretty much went up against Vlad one at a time.
Vladimir has a terrible early game. The only times he fares well is if his opponent is someone who can't do much damage early on such as Nasus or Jax.
He also has a rather short range and no gap closers. Had Vayne, Thresh, and Xerath actually went in together and chained CC and kited Vlad, he might barely make off with one kill before dying.