They do this to protect their brand. If you register for a brand, you must specify for which types of goods or services your brand should be valid. These types are categorized into so called nice classes [1], where each class has a number and covers a group of products. E.g. class 12 is for cars and class 29 is for meat products, including sausages. Your brand registration can include one or multiple nice classes, an…
Does this mean by selling these sausages they retain the right to all these entries in your third link? For example the last one „Vermietung von Datenverarbeitungsgeräten“. Someone could make a business leasing computers under the name Volkswagen if they wouldn’t make these wursts?
No, to my knowledge, each item sold only covers its Nice class it falls into. They don't just sell sausages, they also sell things from a large class of other things. There is an online shop: https://shops.volkswagen.com/de_DE/web/lifestyle