Feng Yang Wind Panda Passive Crit?

I **know** this question has been asked a lot in the past, but does Feng Yang's Passive stack with crit or does it not?

If you think one way or the other please explain (even anecdotally) as to why you think that way.

My story: I tried it for myself but my cr/cd def runes also had very high atk %'s so the damage was a little higher, but not nearly as much defense. So I'm still on the fence with no solid proof.