It looks like you mistyped the URL in your address bar or have followed an old bookmark.
There's a new tutorial on the block that'll teach you everything you need to do about monitoring data from your sensors that takes it a step beyond sending data over WiFi, and shows you how to visualize your data in an IoT dashboard in real time.
Silicon Labs created some amazing project examples, using the SparkFun Thing Plus Matter board, that you can follow once you've got yours up and running. Including gesture recognition and image classification using TensorFlow Lite, counting people in a room, creating an RFID door lock system, and connecting the SparkFun Thing Plus MGM240P to an Android device, these examples are sure to inspire you!