His list is an opinion to be agreed with and to be disagreed with. That is all. The data on the other hand seems more viable but the truth is that it's not the champion that makes the difference, more the summoner. Play a character well, and he/she will be on your own personal tier 1 list.
The low-tier champions on that list are highly disagreeable with, and the same can be said about the high-tier champs. Personally, I don't believe in the whole Tier system, rather the "Flavor of the week" system, in which specific patches have the clear standout champions who are either new or just received a buff increasing their usefulness.
The problem with this system is that it changes clearly every patch, meanwhile the Tier system has a rough standard that stays close to what it was in the last patch.
It's all relative and opinionated. Basically, if you use a champion well, don't be conned into playing another one because yours is on Tier 4. Any champion can be a standout...
... except for Evelyn, when the hell is her buff coming out?