Why is leaderstats not a valid member of Player?

Try this:

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RemoteEvents = ReplicatedStorage.RemoteEvents

local GivePoint = RemoteEvents.GivePoint

GivePoint.OnServerEvent:Connect(function(player) 
	local points = player:WaitForChild("leaderstats").Points
	local ClickBonus = player:WaitForChild("Playerstats").ClickBonus 
	points.Value = points.Value + (1 + ClickBonus.Value) 
	end)