It'll almost certainly mean Pure Vit tanks (Like me) will do more dammage than we did prior to 4.2 but, as it stated, the increese will not give us the same amount of power STR Tanks had in 3.15 and back.

That isn't a nerf it's a reballence. Vit Tanks,which is THE tank stat anyway (along with parry if it was better), will get a buff to make things as they should have always been. STR Tanks, an unintended player made anomaly that was never ment to work as so well, will receive an according kick in nads to officially end its inappropriate choke hold on the meta.

TL:dr, Vit Tanks are getting a buff, STR Tanks are getting destroyed. And then things should get back to normal.