Commodity fetishism is the relationship between the consumer and the product, where the consumer lacks any perception of the labour required in the creation and distribution of the product. The value of the product is determined by the market, the value is completely removed from the people. Before industrialisation you would buy goods from local artisan businesses, for example a piece of furniture would be sold by your local carpenter who is a part of your community. You know the time and skill it took to create the product, you know the person who created the product and their working conditions. Now under hyper capitalism you go onto Amazon and you order your funkopops with same day shipping. Completely removed from how the product is created.
So with respect to the weapons industry, firepower fetishism would be placing a purely market value on weapons while divorcing the products from its purpose and the people who use it and the people who they are used against. Its like the linkedin posts from weapons industry employees exciting about the growth in business shortly after 07/10/23.