Article link: https://developer.roblox.com/en-us/api-reference/property/Humanoid/UseJumpPower

I think this should be amended to say
This property determines whether the Humanoid.JumpHeight (false) or Humanoid.JumpPower (true) property is used.
Moreover, the line after that
When a character spawns, this property is set according to the value of StarterPlayer.CharacterMaxSlopeAngle which defaults to true.
Seems to be completely unrelated to the article.