OP.GG is not a good source of information for this.
But let's go back to your topic.
Mages are dominant now on top lane? yes, some of them are. Viktor for instance has recieved several nerfs, and he is still there. The free movement speed is keeping him safe from most matchups and his shield provide good trades and cheese poke.
Vlad scales good. But he is somewhat gated. Vlad has been in top lane for awhile, so he might get a visit from the nerf bat due to magic pen items.
Ryze is Ryze.
Cass its another mage that has been top lane for awhile. She cant abuse magic pen from boots, and she starts slow early game. She can cheese some poke against you if you dont respect the early level 2-4. The Q pathing and the comet were nerfed i think. it has been commented before.
Lastly Urgot. Yeah, he's strong still. its the shield most likely. IF you ask me. And the fact that he is ranged-ish. His range is kinda low, but top that range with his passive,shield and flip, and you get a beefy bully nonetheless.