It's an interesting article with some interesting thoughts. However, unit tests are - for me - a crucial framework and also a main pillar in my project planning process: If unit tests are written before the actual code, it is immensely useful to define goals in terms of what you want the function - that you are going to write - should actually do and not do.
And especially throwing away passing unit tests is a waste, not the unit test itself. Eventually you, or someone else, wants to make edits to existing code. Unit tests are extremely useful to check if everything "still works"