Master yi hidden change made him broken

So i used to play master yi in aram and i took break in march of 2018.

I don't think it says anywhere in any patch notes but they did a change where master yi's q goes down by 2 seconds every auto attack instead of every critical.

It used to be that whenever master yi would crit his q would have it's coldown reduce by 2 seconds and whenever his q did damage and if it crit it would deal like 180 bonus damage.

Maybe i am a noob but when did they change this ? it makes master yi hard to target because every 3 seconds he is q invincible and i can't target him. I know a root or stun will stop him but in solo q i can't win lane against him.

Maybe they changed it or has it always been 2 seconds of q reduction per auto attack ? Also the marksmen rune conqueror makes it hard to build armor against him because he deals 20% true damage and 15-50 true damage per auto attack with his e.

Any ways i don't know why they changed it from 2 second reduction on critical to 2 second on auto attack. Makes it very easy to Q weave and go constantly invincible every 3 seconds. Thanks for reading and good game.