Why would they want to "anglicise" classes if there was sufficient demand to justify the service. Perhaps they are battling to secure Afrikaans lecturers and perhaps the numbers of afrikaans students don't justify the expense. I leave the speculation as to what their reasons are for wanting to "anglicise" classes, up to you. Bearing in mind that they have always offered afrikaans classes, you should ask yourself what has changed.
By the way, the article says that about 500 -1000 students joined the march. I suppose most of the UP bosses are Afrikaners themselves and yet they are threatening Afrikaners and the FF+. You go figure.