yea, it's the classic riot reaction to constant complains about tankiness, tanks and tank items feeling bad.
Just throw in more stuff that makes tanks feel misserable.
The worst thing is his ult, cause it uses the health of a tank to kill it's own squishys. If you pick chogath into Sett, you can be reported for helping the enemie cause a stacked up cho can deal 2k+ damage to his own backline if used by Setts ult.
Going tanky already feels bad, but with Setts ult, building health actually increases your opponents damage vs your team instead of prolonging your live...
Then there is his W. It can store alot of damage which decays quickly, and it depends on the actuall POST mittigation damage he recives, so building resis on him actuall lowers his damage, so he even has a mechanic that makes resis even worse for him than they already are for anyone else....
The sad thing is that he would be a great design, he plays fluid, has counterplay, is rather simple yet with some decent potential for skill expression, has enough utillity to help in teamfights even if behind, yet not to much to be overbearing if ahead.
But the way he is tuned, he's just living mockery for tanks and their stuff, and that's disgusting.