well yea, unicode doesn't include nazi symbolism for obvious reasons, so the nazis have to get creative
i could, with the good faith GOG frankly doesn't deserve, see how the first two symbols could've happened accidentally. but the SS? nah, whoever wrote this email did this 100% intentionally.
this is nazi shit, in the same way that someone sending you "hey pretty do you want to have some 🍆🍑💦" is not inviting you to drink a peach-eggplant cocktail.