Why doesn't this method straight from the wiki work?

For several days I have been wondering why this method of saving player data doesn't work. Can anyone try this method out, and vouch that it doesn't work?

What would you need to do to test:

1. Create a ModuleScript

2. Place the ModuleScript inside the ServerStorage

3. Paste this code unedited, directly from the wiki inside the ModuleScript:

-- Set up table to return to any script that requires this module script
local PlayerStatManager = {}
 
local DataStoreService = game:GetService("DataStoreService")
local playerData = DataStoreService:GetDataStore("PlayerData")
 
-- Table to hold player information for the current session
local sessionData = {}
 
local AUTOSAVE_INTERVAL = 60
 
-- Function that other scripts can call to change a player's stats
function PlayerStatManager:ChangeStat(player, statName, value)
	assert(typeof(sessionData[playerUserId][statName]) == typeof(value), "ChangeStat error: types do not match")
	local playerUserId = "Player_" .. player.UserId
	if typeof(sessionData[playerUserId][statName]) == "number" then
		sessionData[playerUserId][statName] = sessionData[playerUserId][statName] + value
	else
		sessionData[playerUserId][statName] = value
	end
end
 
-- Function to add player to the 'sessionData' table
local function setupPlayerData(player)
	local playerUserId = "Player_" .. player.UserId
	local data
	local success, err = pcall(function()
		playerData:UpdateAsync(playerUserId, function(playerData)
			data = playerData
		end)
	end)
 
	if success then
		if data then
			-- Data exists for this player
			sessionData[playerUserId] = data
		else
			-- Data store is working, but no current data for this player
			sessionData[playerUserId] = {Money=0, Experience=0}
		end
	else
		warn("Cannot set up data for player!")
	end
end
 
-- Function to save player's data
local function savePlayerData(playerUserId)
	if sessionData[playerUserId] then
		local success, err = pcall(function()
			playerData:SetAsync(playerUserId, sessionData[playerUserId])
		end)
		if not success then
			warn("Cannot save data for player!")
		end
	end
end
 
-- Function to save player data on exit
local function saveOnExit(player)
	local playerUserId = "Player_" .. player.UserId
	savePlayerData(playerUserId)
end
 
-- Function to periodically save player data
local function autoSave()
	while wait(AUTOSAVE_INTERVAL) do
		for playerUserId, data in pairs(sessionData) do
			savePlayerData(playerUserId)
		end
	end
end
 
-- Start running 'autoSave()' function in the background
spawn(autoSave)
 
-- Connect 'setupPlayerData()' function to 'PlayerAdded' event
game.Players.PlayerAdded:Connect(setupPlayerData)
 
-- Connect 'saveOnExit()' function to 'PlayerRemoving' event
game.Players.PlayerRemoving:Connect(saveOnExit)
 
return PlayerStatManager

1. Create a Script and place it inside of the ServerScriptService

2. Copy this code into the script:

local serverstorage = game:GetService("ServerStorage")
local module = require(serverstorage.ModuleScript)

game:GetService("Players").PlayerAdded:Connect(function(player)
	local stats = Instance.new("Folder")
	stats.Name = 'leaderstats'
	stats.Parent = player
	
	local money = Instance.new("NumberValue")
	money.Name = 'Money'
	money.Parent = stats
	
	local experience = Instance.new("NumberValue")
	experience.Name = 'Experience'
	experience.Parent = stats
	
	module:ChangeStat(player, 'Money', 5)
end)

1. Check 'Enable Studio Access to API Services' located in the Configure this game settings.

2. Report back your findings.

Any help would be appreciated, thanks.