Please go read "How to Be an Antiracist" by Ibram X. Kendi. I find him to be the most concise and cogent definer of both racism and antiracism. Once you've read the book, you'll need to go back and revisit your first four points - not because your reading of confusing cultural race ignorance is wrong, but because you need to write to the best definition of antiracism if you want to contribute to the work. You make some interesting points, keep struggling. Try to remember that you're not the most clever person in the room, you're just another person struggling to make sense of this mess. It works better if we do it together instead of trying to make ourselves seem smarter than others.