Why Isn't This Code Filtering Strings Properly?

Hi! I recently started trying to learn about how to create your own chat system so I chose to follow some tutorials. This one to be exact. I've followed every step and double checked everything but the thing is that even though it prints out the texts, it prints them out even if they are profane. And I don't know what I'm doing wrong. I know that there isn't anything wrong with the build in functions (obviously), so it has to be (I'm assuming) the way I use those functions.

I have a remote event in game.ReplicatedStorage

Local script:

--Local script

local textbox = script.Parent
local uis = game:GetService("UserInputService")
local sendMsg = game.ReplicatedStorage:WaitForChild("RemoteEvent")
textbox.FocusLost:Connect(function(text)
    sendMsg:FireServer(textbox.Text)
    textbox.Text = ""
end)



uis.InputBegan:Connect(function(key)
    if key.KeyCode == Enum.KeyCode.T then
        if textbox:IsFocused() == false then
        textbox:CaptureFocus()
        end
    end
end)

ServerScript:

--ServerScript

local sendMsg = game.ReplicatedStorage:WaitForChild("RemoteEvent")
local textService = game.TextService-- or game:GetService("TextService")


local function filterText(Input,player)
    local filteredtext
    local success, errorMessage = pcall(function()
         filteredtext = textService:FilterStringAsync(Input, player)
    end)


        if success then
            return filteredtext
        elseif errorMessage then
            print("error: ",errorMessage)
        end
    return false
end

local function filteredText(filtertext)
    local filteredMessage
    local success, errorMessage = pcall(function()
        filteredMessage = filtertext:GetNonChatStringForBroadcastAsync()
    end)
    if success then
        return filteredMessage
    else
        print("error: ",errorMessage)
    end
    return false
end

local function isMessageValid(player, Message)
    if Message ~= "" then
        local messageObject = filterText(Message, player.UserId)
        local filteredMessageObj = ""
         filteredMessageObj = filteredText(messageObject)
        print(filteredMessageObj)
        game.Workspace.Part.SurfaceGui.TextLabel.Text = filteredMessageObj
    end
end

sendMsg.OnServerEvent:Connect(isMessageValid)

Any help would be great.