@ Susmita, per the code, the path to this image, "moz-screenshot-1.png", leads to the filel saved locally on your computer. Unfortunately, this will not work for us - though it may for you - as we can not access your local files. In short, the image source is wrong and you might want to try this again.
It's actually an "educational" game, where the poster is drawing tactics from the B&C community and implementing the best of them in this mock match. He's done a nice job of illustrating the game with his battle maps and notes that "actual dice rolls will be used", but he may "adjust dice rolls that make the game more educational."
I've barely touched on the meat of the thread, but if you skip around to the battle maps and the brief summaries under them, you can get the gist of what's going on.
Black Templars are quite divergent from a typical Space Marine army with only a precursory glance, but they are Marine's in the end and use similar units and mostly identical vehicles, so this should be good considering the amount of SM players we have. I thought it might also lend some insight for Billy as Tau, or at the very least maybe another interesting army list to consider. I imagine it could be valuable to everyone else as well to see how these two armies could handle particular situations.