Imagine a shirt that sells for $20 on the market. The shirt is composed of $5 from raw materials and depreciated tools and $15 from your transformative labor. The boss pays you $5 for your work and makes off with $10. The boss steals way more than their investment. They'll tell you (e.g. Paul Pester from the article) that they have more responsibility: this is a bold-faced lie. Corporations are never held responsible for the havoc they wreak on society and the Earth.
The result of this arrangement is the obvious wealth inequality graphs that we've all seen. This is the true injustice. The CRUD worker making $150k and the food laborer making $40k are fighting for scraps. We should focus our fighting upwards.
So no, I wouldn't call it "stealing", rather an exchange that is not immediately obvious because it's not entirely monetary/transactional in nature.