Devour enchantment incorrect tooltip?

The devour tooltip says it gives 40% AS and 10% CDR but it gives 0% CDR in game. (tried running ranger trailbazer -> devour + nashors tooth on kayle jungle but was missing 10% CDR)

Then I took a look at the lolwiki and saw that devour enchantment gave just 50% CDR.

Is the tooltip wrong or is this a bug?