Why is ashe strong vs renekton?

I just tried to play ashe top vs him, and I have some mong wailing at me that ashe is strong vs him. So I fed because post 6 he could tower dive me fairly easily, losing about half his hp in the process, if he ulted even less. So I'm really confused to how ashe is strong against him? Like I know she's great against immobile tanks but renekton? He's not immobile, he seems like a tank assassin with no mana, his combos one shot ashe and it doesn't matter she can slow him because his dashes are ridiculous.
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