Olaf should not be able to ignore attack speed slows with his Ragnarok
His R reads:
PASSIVE: Olaf gains bonus armor and magic resistance while Ragnarok is inactive. BONUS RESISTANCES: 20 / 30 / 40 ACTIVE: Olaf cleanses himself of all crowd control and becomes immune to it for 6 seconds, gaining bonus attack damage for the duration. For the first second of Ragnarok, he also gains bonus movement speed when moving towards nearby visible enemy champions.
Therefore attack speed slows, like Frozen Heart aura is not a cc, yet he is immune to it. Honestly, it's like an improved version of Master Yi's ultimate, ignoring all possible effects. I guess attack speed slows are coded as crowd control, could they not be Riot?