If i dont use text filtering in my solo game will my game be under reveiw?

In short, yes. If strings are not filtered, your game will be put under review. Please note that confusing filtering enabled being off making your game 13+ is nothing to do with filtering strings.

Here is an example of filtering a string.

game.Players.PlayerAdded:Connect(function(plr)
    plr.Chatted:Connect(function(msg)
        local filteredstring = game:GetService("Chat"):FilterStringForBroadcast(msg, plr)
        print(filteredstring)
    end)
end)

This must be used in a serverscript.