“API covers the public set of Kraken endpoints 142”
(a) The link itself now just says, go look elsewhere man, I gots nuffink.
(b) The API is now both Kraken and Helix (with preference to Helix)
Correct links would be https://dev.twitch.tv/docs/v5/ (Kraken) and https://dev.twitch.tv/docs/api/ (Helix).