Feedback is not a communication style. It is a specific act with a specific risk attached. The risk is that the person on the receiving end hears a judgement about who they are rather than an observation about something they did. Once that happens, the conversation stops being about the work and starts being about the person's sense of themselves.
Language is the main tool for managing that risk. Not tone, not body language, not the relationship. Those things matter, but they cannot compensate for language that is imprecise or that carries implicit judgement.
The course is built on the idea that if you have the right language, you can have better feedback conversations. Not perfect ones. Better ones.