The professor is required to teach, however, learning is entirely up to you.
While many professors still have not gotten the hang of online teaching, you need to make sure that you aren’t missing anything. In my decades of teaching, I have learned that students rarely take the time and effort to read the syllabus. So, before you decide to complain, you first need to make sure that you are not missing anything. There may be a list of articles to read, which you have missed. There may be a schedule of discussions which you have missed, there may be Zoom sessions which you have missed.
Many a student has complained about class because of an issue which arose because the student had not actually read the syllabus and/or was not regularly checking the class Canvas site.