I measured it using an image editing tool, I don't know what the API does. I used the champion ability showcase video and now I'm also checking actual gameplay and the angle seems to be quite larger than 70 degrees, much closer to a 90 degree angle. This should be probably opened up as a discussion somewhere.
This is the image that I used to analyze the cone, and it turned out to be 82 degrees. Most likely Riot would use a round value because that's what they do nowadays, therefore it's either 70, 75 or 80 apparently if it has to be one of them, assuming that the angle is messed up because of the PoV.
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